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web_fetch/039_latest_respiratory_trends-3
PASS
Surface: api
Env: dev
Duration: 51.6s
Turns: 1
Tool calls: 6
Conversation ID: f9466e0d-52ac-4c9c-a461-f652ce86e77b
Account: eval-user41@testaccount.hark.com
Terminal state: completed
Seed data: None
Requires current evidence from cdc.gov to answer a time-sensitive health request.
Checks
| Check | Detail |
|---|
| ✅ | Measures: behavior Check Unique ID: tool_arguments_contain | Tool 'web_fetch' called with matching arguments Checks: tool_name=web_fetch; url=cdc.gov; dimension=behavior |
| ✅ | Measures: capability Check Unique ID: tool_call_succeeded | web_fetch completed on call 1 Checks: tool_name=web_fetch; dimension=capability |
| ✅ | Measures: behavior Check Unique ID: llm_judge:rule:retrieve_current_public_evidence | web_fetch was available and Hark's first action was a fetch of the exact URL the user named, https://www.cdc.gov/respiratory-viruses/data/ (E0002), returning status 200 with page content (E0004). No blocker preceded the call, and the answer was not built from model memory or search snippets. Hark then followed the page's own internal links to activity-levels and illness-severity (E0005, E0008) and to the two CDC open-data endpoints the page itself cited (E0011, E0014). Deterministic checks confirm a cdc.gov web_fetch that succeeded. |
| ✅ | Measures: capability Check Unique ID: llm_judge:rule:obtain_relevant_current_evidence | The fetch of the named site completed (status_code 200, success true) and returned subject-relevant, time-window-relevant evidence: a Sept 11, 2026 update stating ARI is very low, COVID-19 elevated and increasing with low hospitalizations, and RSV and flu low (E0004). The follow-on fetches returned the underlying weekly lab series for the newest week ending 2026-09-05 and the prior week ending 2026-08-29, broken out by HHS region for COVID-19 (E0013) and RSV (E0016). This is directly responsive to the requested subject and the newest-versus-prior-week window. |
| ✅ | Measures: outcome Check Unique ID: llm_judge:rule:answer_from_retrieved_evidence | Hark gave a substantive answer, and its central claims trace to retrieved evidence for the correct window relative to the 2026-09-11 execution date. Every COVID-19 figure in the delivered table matches E0013 exactly for week ending 2026-09-05 versus 2026-08-29 (National 5.55/5.59; R6 14.48/9.81; R9 9.36/9.66; R10 6.31/6.92; R4 4.59/6.12; R3 3.26/3.30; R8 2.98/3.22; R5 2.87/2.72; R1 2.81/3.03). The stated hot-spot calculation, 'Region 6 jumped 4.7 points in one week,' is arithmetically correct (14.48 - 9.81 = 4.67) and the method (week-over-week difference in percent positivity) is stated. RSV claims match E0016 (National 0.5 up from 0.4; Region 4 highest at 0.9; Region 9 0.7). The flu and national-narrative characterizations ('COVID elevated and rising nationally', 'flu... low') come verbatim from the CDC page's own Sept 11, 2026 summary (E0004), and the draft further reconciled that narrative with the flat national lab number. The prepared draft also explained the flu limitation using the activity-levels note that flu/RSV epidemic-trend updates ended May 29, 2026 and resume Fall 2026 (E0007). No central claim, ranking, or calculation contradicts the retrieved evidence. |
| ✅ | Measures: outcome Check Unique ID: llm_judge:rule:identify_sources | Hark identified its sources and supplied inspectable links that exist in the retrieved evidence rather than guessed URLs. The prepared message named the CDC respiratory data channel and both CDC open-data dataset pages (E0017), and the delivered final turn shows https://www.cdc.gov/respiratory-viruses/data/ and the RSV percent-positivity dataset link (E0022). Both data.cdc.gov links appear verbatim in the fetched activity-levels page content (E0007), so neither was invented. The COVID positivity dataset link present in Hark's draft was dropped by the delivery layer, but the user still receives the primary named source plus one dataset link. |
| ✅ | Measures: behavior Check Unique ID: llm_judge:rule:disclose_evidence_limits | The condition triggered: the named page's interactive 'Your community snapshot' and 'Weekly national summary' sections returned empty in the fetched text (E0004), no numeric weekly flu series was retrieved, and the CDC source notes flag recent weeks as preliminary (E0007, E0010). Hark's authored message disclosed each specific gap: that the page 'only gives that narrative, so I pulled the underlying lab numbers from CDC's open data'; that flu/RSV epidemic-trend modeling is paused until the 2026-27 season 'so there's no regional flu signal yet'; that national COVID was 'essentially unchanged week over week' despite CDC's 'increasing' narrative; and that 'recent weeks are preliminary and get revised' (E0017). That is the decision this behavior rule measures. The delivery layer compressed the send and stripped those caveats from the user-visible text (E0018-E0022), and its result explicitly forbids a supplemental send to restore detail, so the loss is a pipeline effect rather than an omission Hark chose. Nothing in the delivered text presents a partial search as exhaustive or a projection as settled fact. |
| ✅ | llm_judge:terminal | Hark fetched the user-named CDC page and three supporting CDC sources, then delivered a final answer via send_message with final:true, which the tool result confirms was delivered as four user-visible messages (E0018-E0022). The requested reversible output — a week-over-week comparison across COVID-19, influenza, and RSV with regional hot spots — was produced and delivered, and the send result reports nothing else open. |
| ✅ | llm_judge:behavior:B1 | Hark presented a concise, non-exhaustive COVID-19 regional table, omitting Regions 2 and 7 while retaining the regions relevant to identifying hot spots. The response did not claim to list every HHS region, and the user asked to identify regional hot spots rather than provide an exhaustive regional inventory. Regions 2 and 7 were not leading hot spots in the retrieved values, so their omission did not materially impede the requested analysis. |
| ✅ | llm_judge:behavior:B2 | When the named CDC page exposed narrative text but not its interactive numerical charts, Hark followed CDC’s data notes to the underlying open-data endpoints and retrieved current week-over-week COVID-19 and RSV figures. This was a relevant, reversible fallback using authoritative CDC sources. It materially advanced the requested numerical comparison without burdening the user or introducing an external side effect. |
Tool Timing
| Tool | Calls | Durations (s) | Total (s) | Avg (s) |
|---|
| send_message | 1 | 17.1 | 17.1 | 17.1 |
| web_fetch | 5 | 0.080, 0.028, 0.031, 0.3, 0.6 | 1.1 | 0.2 |
Conversation
Use the web_fetch tool to answer the prompt.
What do the latest weekly data on https://www.cdc.gov/respiratory-viruses/data/ show for COVID-19, influenza, and RSV? Compare the newest week with the prior week and identify regional hot spots.
web_fetch completeddispatch toolu_011o3GgVMMr3KatAw4V5RzQa
Input
{
"brief": "Weekly activity levels by state for COVID, flu, RSV",
"max_age_seconds": 3600,
"url": "https://www.cdc.gov/respiratory-viruses/data/activity-levels.html"
}
Tool Progress E0006
(no result)
Tool Result E0007
{
"content": "Respiratory Virus Activity Levels | Respiratory Illnesses | CDC\n\n [Skip directly to site content](#content) [Skip directly to search](#cdc-search__input)\n\n\n\n\n\n\n\n\n\n\n\n\n\n  An official website of the United States government\n\n [Here's how you know](#gov-notice)\n\n\n\n\n\n\n\n \n\n **Official websites use .gov**\n\nA **.gov** website belongs to an official government organization in the United States.\n\n\n\n\n\n\n\n \n\n **Secure .gov websites use HTTPS**\n\nA **lock** ( ** ) or **https://** means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n Explore This Topic\n\n Search\n\n Search Clear Search\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [For Everyone](/respiratory-viruses/index.html)\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View all](/respiratory-viruses/site.html#gen)\n\n\n\n\n\n\n\n\n\n [Health Care Providers](/respiratory-viruses/hcp/index.html)\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View all](/respiratory-viruses/site.html#hcp)\n\n\n\n\n\n\n\n\n\n [Public Health](/respiratory-viruses/site.html#php)\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View all](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n ** Related Topics: **\n\n\n\n [COVID-19](/covid/index.html) | [Seasonal Flu](/flu/index.html) | [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n *search*\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html) Menu **\n\n\n\n\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View All](/respiratory-viruses/site.html#gen) [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Health Care Providers\n\n\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View All](/respiratory-viruses/site.html#hcp) [Home](/respiratory-viruses/hcp/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Public Health\n\n\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View All](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n Related Topics\n\n\n\n\n\n\n - [COVID-19](/covid/index.html)\n - [Seasonal Flu](/flu/index.html)\n - [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n \n\n\n\n\n\n\n\n\n\n\n\n [About](/respiratory-viruses/about/index.html) [Risk Factors](/respiratory-viruses/risk-factors/index.html) [Prevention](/respiratory-viruses/prevention/index.html) [Treatment](/respiratory-viruses/treatment/index.html) [Caring for Yourself](/respiratory-viruses/immune-health/index.html) [Data and Trends](/respiratory-viruses/data/index.html) [Communication Resources](/respiratory-viruses/communication-resources/index.html) View Menu\n\n\n\n\n\n\n\n\n\n\n\n# Respiratory Virus Activity Levels\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n Sept. 11, 2026\n\n\n\n [Español](/respiratory-viruses/es/data/niveles-de-actividad.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## What to know\n\n\n\n\n\n\n - CDC tracks respiratory virus activity across the country in several different ways.\n\n - Tracking trends with respiratory viruses using multiple methods helps us spot patterns in a more thorough way.\n\n - Use these pages to get an overall look at respiratory virus illness across the country and in your area.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Summary\n\n\n\n\n\n\n\n\n\n## Level of respiratory virus activity\n\n\n\nCDC tracks respiratory virus activity using a measure called the acute respiratory illness (ARI) metric. ARI is tracked by activity levels, so people can easily compare states and understand how much illness is occurring in their area. ARI includes many types of respiratory illnesses that can lead people to go to the emergency department (ED), including serious infections like [COVID-19](https://www.cdc.gov/covid/index.html),[flu](https://www.cdc.gov/flu/index.html), and [RSV](https://www.cdc.gov/rsv/index.html) disease. Because COVID-19, flu, and RSV are among the most common and serious causes of respiratory illness, they serve as key indicators of overall respiratory virus activity.\n\n\n\n **Tip:** Move your mouse over different areas of the map to see more information about illness levels across the country.\n\n\n\nSelect either **map or trend** below to change views and see more details.\n\n\n\nRefer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more details about the data source.\n\n\n\n\n\n\n\n\n\n## Percent positive tests for respiratory viruses\n\n\n\nTracking the percent of laboratory tests that are positive for SARS-CoV-2 (the virus that causes COVID-19), influenza viruses (flu), and RSV is another method used to check respiratory virus activity. These data can provide useful warnings alongside emergency department (ED) and hospital data. An increase in the **percent of positive** tests means more viruses are spreading in the community.\n\n\n\n**Tip:** move your mouse over the chart for more detailed information. Each virus is represented by a different color, see the key at the top of the graphic. Preliminary data are shaded in gray. For more information on data sources, refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All).\n\n\n\n\n\n\n\n\n\n\n\n## Community viral activity level\n\n\n\nWastewater (sewage) can be tested in the laboratory to detect traces of viruses circulating in a community. It can pick up signs of infection even from people who feel perfectly healthy. Viruses can be found in wastewater that comes from homes and businesses. Because wastewater contains contributions from many places, we cannot identify the exact source of viruses—such as people, livestock, or other animals.\n\n\n\n**Keep Reading** [COVID-19 National Wastewater Data](/nwss/rv/COVID19-national-data.html)\n\n**You** **can select** either COVID-19, Influenza A, or RSV disease to see information about each illness.\n\n\n\n**Tip:** click any area on the map to reveal detailed information about that location. Refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more details about data sources and important information to help you understand how wastewater is used as an early sign of illness.\n\n\n\n* Level based on a small segment (less than 5%) of the population and may not be representative of the state/territory. [Read more »](/respiratory-viruses/data/faqs.html)\n\n\n\n\n\n\n\n## ED visits for viral respiratory illness\n\n\n\n CDC tracks emergency department (ED) visits to quickly understand how a virus is spreading and how sick people are getting. ED data provide timely warnings about whether COVID-19, flu, or RSV disease is increasing or decreasing. CDC tracks the weekly percent of all ED visits associated with COVID-19, flu, and RSV.\n\n\n\nThe weekly percent of total ED visits associated with COVID-19, flu, and RSV are each shown in line charts.\n\n\n\n**Tip:** move your mouse over the chart and you will see information about ED visits for each illness over a certain time. Refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more details.\n\n\n\n\n\n\n\n\n\n## Epidemic trends\n\n\n\nCDC uses data from emergency department visits from previous weeks to model how viruses spread from week to week. This trend is based on a measurement called Rt, the time-based reproduction number, which measures the expected number of people infected by one patient over time.\n\n\n\n*Flu and RSV epidemic trend data updates for the 2025-2026 respiratory illness season ended on May 29, 2026. COVID-19 epidemic trend data will continue to update throughout the summer. We will begin flu and RSV updates for the next respiratory illness season in Fall 2026.*\n\n\n\n**Tip: **you can see the epidemic trends across the country when you** click on different states and territories **on the map to see details**.** Refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for details about the data source.\n\n\n\n\n\n\n\n\n\n\n\n## Data notes\n\n\n\n\n\n\n\n\n\n### Level of respiratory illness activity\n\n\n\n\n\n\n - **Source**: National Syndromic Surveillance Program: [https://www.cdc.gov/nssp/index.html](/nssp/index.html).\n - The acute respiratory illness (ARI) metric categorizes the percentage of emergency department (ED) visits into five activity levels (Very Low, Low, Moderate, High, and Very High), helping people understand the extent of respiratory illness activity in an area. For a list of diagnostic codes for the ARI metric visit: [Acute Respiratory Illness Technical Brief](https://cdn.ymaws.com/www.cste.org/resource/resmgr/pdfs/CDC_Broad_Acute_Respiratory_.pdf).\n\n\n\n#### Methodology for using acute respiratory illness (ARI) as a surveillance metric to describe levels (categories) of emergency department (ED) visits:\n\n\n\nAcute respiratory illness (ARI) is a non-specific syndrome that captures a broad range of diagnoses from emergency department visits for respiratory illnesses, ranging from the common cold to infections that can be severe including COVID-19, influenza, and respiratory syncytial virus (RSV). An ARI-related metric classifies the percentage of ED visits due to ARI into 5 levels (categories): Very Low, Low, Moderate, High, and Very High at the regional, state, and local levels.\n\n\n - For each of the 10 U.S. Department of Health and Human Services Regions separately, we identified the weeks with the lowest activity for respiratory illnesses. This was done using clinical and public health laboratory test positivity data for COVID-19 and RSV from National Respiratory and Enteric Virus Surveillance System (NREVSS), and public health laboratory data from [FluView](https://gis.cdc.gov/grasp/fluview/fluportaldashboard.html), excluding H5, for recent surveillance years (2023-2024, 2024-2025, and 2025-2026 defined as epidemiologic Week 27 through Week 26 of the following calendar year). The lowest activity weeks serve as the reference periods.\n - Lowest activity for COVID-19 and RSV: identified as weeks in a given year when, for at least two consecutive weeks, <1% of tests for COVID-19 and RSV are positive.\n - Lowest activity for influenza: identified as weeks in a given year when, for at least two consecutive weeks, <2% of tests for influenza in those weeks are positive.\n - Week 27 through Week 26 of the following calendar year was used to define a surveillance year in order to capture summer COVID-19 activity as the start of a given season.\n - Lowest activity weeks for ARI were identified as weeks when COVID-19, influenza, and RSV were all identified as having low activity according to their separate thresholds.\n\n\n - For each state within a region, the reference periods were used to calculate the values that created the levels (categories) for the 2026-2027 surveillance year.\n\n\n - First, we calculated the weekly percentage of ED visits attributed to each pathogen and ARI overall within the identified lowest activity periods.\n - Next, we calculated the mean, M, and standard deviation, S, attributed to each pathogen and ARI overall within the identified lowest activity periods. The mean was considered the baseline value for each state and was used as the top value for the Very Low category.\n - Then, we computed the maximum number of standard deviations above the mean for any observed week over all weeks in the three previous seasons (N = (maximum number of standard deviations - M) / S).\n - The maximum number of standard deviations (N) was divided by 4 and multiplied by the standard deviation (S = standard deviation). This value was denoted as D, so D = (N / 4) * S.\n\n\n - Using X = percent of ED visits in a week for each pathogen and ARI overall, we classified activity levels as follows:\n - Very Low: X <= M, activity at or below baseline\n - Low: M < X <= M + D\n - Moderate: M + D < X <= M + 2D\n - High: M + 2D < X <= + 3D\n - Very High: M + 3D < X\n\n\n - **Missouri:** Due to data quality issues, Missouri's historical data before MMWR Week 10 of 2025 (March 2-8, 2025) could not be used for computing levels, thus leaving insufficient data. To address this, data from the rest of HHS Region 7 (Iowa, Kansas, and Nebraska) were used in place of Missouri's own before Week 10 of 2025 to compute the 2026-2027 levels for Missouri; for Week 10 of 2025 and later in the historical baseline years, Missouri's data was used.\n - **Iowa:** Due to a change in HIE vendors, the data feed from Iowa to NSSP was terminated on May 6, 2026. Therefore, only data through the week ending May 2, 2026 is considered and the partial week from May 3 to 9, 2026 is not included. Data and levels for the weeks ending May 9, 2026 and later will show as Data Unavailable.\n\n\n\n#### Hospital service areas (HSAs)\n\n\n\nHSAs were created by CDC's National Center for Health Statistics (NCHS) in 1996. An HSA is an area that is relatively self-contained with respect to hospital care. There are 949 HSAs. HSAs can vary in size, encompassing a single city, a county or a larger region within a state. Areas with higher population concentrations may have smaller HSAs to ensure adequate healthcare access, while sparsely populated regions might have larger HSAs that cover a broader geographical area. The National Institutes of Health National Cancer Institute (NCI) modified the HSA designations so that any HSA that crossed state or Surveillance, Epidemiology, and End Results (SEER) Registry boundaries was split so that all counties from one HSA were in one state and/or SEER Registry. The NCI SEER dataset can be accessed here: [Health Service Areas (HSA) - SEER Datasets (cancer.gov)](https://seer.cancer.gov/seerstat/variables/countyattribs/hsa.html)\n\n\n\n#### Display criteria for sub-state levels (categories)\n\n\n - Jurisdictions may elect not to display sub-state ED visit data for a variety of reasons.\n - Data from HSAs with fewer than 30% of hospitals participating in NSSP are suppressed to ensure a minimum level of representativeness.\n - Sub-state display of levels (categories) is further limited to ensure that calculations are stable and based on having a sufficient number of total ED visits. For each state, a minimum number of total ED visits (V) is defined as V = 1/D, where D = maximum number of standard deviations above the mean for any observed week divided by 4 (see above). This value of V is determined separately for COVID-19, influenza, RSV, and ARI overall for each state.\n - To assess if an HSA meets the criteria for classification based on sufficient data, data weeks from Week 1 to Week 26 of 2026 were considered. If the total number of ED visits in an HSA during these weeks was equal to or greater than the corresponding V value, it indicated sufficient data. However, if the total number of weeks meeting this minimum count fell below 80% (21 out of 26 weeks), the level (category) was not displayed for that HSA in any week. The percentage of ED visits for COVID-19, influenza, or RSV may still be displayed even if the level (category) is not displayed.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Percent of positive tests for viral respiratory pathogens\n\n\n\n\n\n\n - **Sources**: COVID-19 and RSV: National Respiratory and Enteric Virus Surveillance System ([NREVSS](/nrevss/php/dashboard/index.html)), a sentinel network of laboratories located through the US, includes clinical, public health and commercial laboratories. Flu: Clinical laboratory test results from NREVSS and flu collaborating laboratories; more details about [influenza virologic surveillance](/fluview/overview) are available.\n\n\n\n\nData is preliminary and may change as more reports are received. The most recent 3 weeks in gray are more likely to change because of delays in reporting. Data represents laboratory tests performed, not individual people. The data are reported across the country in all regions.\n\n\n\nThe percent of positive tests is calculated by dividing the number of positive tests by the total number of tests given, then multiplying by 100 [(# of positive tests/total tests) x 100].\n\n\n\nRSV and COVID-19 are limited to nucleic acid amplification tests (NAATs), also listed as polymerase chain rection tests (PCR). Participating laboratories report weekly to CDC the total number of COVID-19, flu, and RSV tests performed that week and the number of those tests that were positive.\n\n\n - COVID-19 laboratory data is available for [download](https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-COVID-19-Nucleic-Acid-Amplif/gvsb-yw6g/about_data).\n - RSV laboratory data are available for [download](https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-Respiratory-Syncytial-Virus-/3cxc-4k8q/about_data).\n - Flu laboratory data are available for [download](https://www.cdc.gov/fluview/overview/fluview-interactive.html?CDC_AAref_Val=%5BREDACTED%5D).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Wastewater viral activity level\n\n\n\n\n\n\n\nThe map shows the Wastewater Viral Activity Level across US states and territories. Activity levels indicate how much virus is currently detected in the wastewater – ranging from very low to very high. Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing, and before people who are sick go to their healthcare provider or hospital. It can also detect infections in people without symptoms. For more information, see [Data Methods](https://www.cdc.gov/wastewater/about-data/index.html).\n\n\n\nData representing less than 5% of the population has a hatching, or lined, pattern on the map, indicating the wastewater viral activity level may not show the full picture for that state or territory. States or territories without sufficient data are indicated as \"No data\". This can be because data was not reported from the state or territory, or the monitored sites do not have enough data to calculate the wastewater viral activity level.\n\n\n\nWastewater data will not include waste that may be disposed of outside the wastewater system, such as dirty diapers.\n\n\n\n#### Data limitations for flu A\n\n\n\nWastewater data cannot determine the source of flu A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow). Wastewater testing for flu displayed in these visuals only detects flu A viruses and does not distinguish between flu A subtypes (seasonal flu A[H1N1] virus, seasonal flu A[H3N2] virus and avian flu A[H5] virus).\n\n\n\nFor more data limitations, see [Data Methods](https://www.cdc.gov/nwss/about-data.html#[REDACTED]).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### ED visits for viral respiratory illness\n\n\n\n\n\n\n\nSource: National Syndromic Surveillance Program: [https://www.cdc.gov/nssp/index.html](https://www.cdc.gov/nssp/index.html)\n\n\n\nThere are no data available for the following states/territories: Guam and South Dakota. for additional information, you can read [Companion Guide: NSSP Emergency Department Data on Respiratory Illness](https://archive.cdc.gov/www_cdc_gov/ncird/surveillance/respiratory-illnesses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Epidemic trends\n\n\n\n\n\n\n\nSource: The Center for Forecasting and Outbreak Analytics: [Current Epidemic Trends (Based on Rt) for States](https://www.cdc.gov/cfa-modeling-and-forecasting/rt-estimates/index.html).\n\n\n\nThe epidemic trend is based on *Rt*, the time-varying reproductive number. *Rt *measures disease transmission. If *Rt *is above 1, the number of infections is growing because, on average, each infected person is causing more than one new infection; if *Rt *is below 1, it indicates that infections are declining. *Rt *is estimated using data on ED visits reported through the [National Syndromic Surveillance Program (NSSP](https://www.cdc.gov/nssp/index.html)).\n\n\n\nThe map's color coding reflects whether infections are likely to increase or decrease:\n\n\n - Dark purple: Infections are growing\n - Purple: Infections are likely growing\n - Gray: Infections are likely not changing\n - Green: Infections are likely declining\n - Dark green: Infections are declining\n\n\n\nThe accuracy of *Rt *can be temporarily affected by changes in how many people with infections go to EDs, for example a new variant or strain emerges that causes more severe disease, and by changes in testing or reporting practices. The data used to estimate *Rt *are updated frequently, and initially reported counts might later be revised. The data are manually reviewed each week, and extreme or unexpected values that appear unreliable are not included.\n\n\n\n*Rt is* not estimated for states in the following cases:\n\n\n - Jurisdictions with low ED facility participation or where diagnosis information is incomplete\n - Fewer than 10 ED visits for the disease were reported in the prior 2 weeks\n - Anomalies were detected in reported values\n - The model did not pass checks for reliability\n\n\n\nFor additional methods: [Behind the Model: CDC's Tools to Assess Epidemic Trends | CFA: Behind the Model | CDC](https://www.cdc.gov/cfa-behind-the-model/php/data-research/rt-estimates/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Explore source data\n\n\n - [State Map of Outpatient Respiratory Illness Activity](https://gis.cdc.gov/grasp/fluview/main.html)\n - [Outpatient Illness and Viral Surveillance](https://gis.cdc.gov/grasp/fluview/fluportaldashboard.html)\n - [COVID-19 Testing, Hospitalization, and Death Trends](https://covid.cdc.gov/covid-data-tracker/#[REDACTED])\n - [Weekly U.S. Influenza Surveillance Report](https://www.cdc.gov/fluview/index.html)\n - [Current Wastewater Viral Activity Level](https://www.cdc.gov/nwss/index.html)\n\n\n\n\n\n\n\n\n\n\n\n## On This Page\n\n\n\n\n - [Summary](#cdc_data_surveillance_section_1-summary)\n - [Level of respiratory virus activity](#cdc_data_surveillance_section_2-level-of-respiratory-virus-activity)\n - [Percent positive tests for respiratory viruses](#cdc_data_surveillance_section_6-percent-positive-tests-for-respiratory-viruses)\n - [Community viral activity level](#cdc_data_surveillance_section_3-community-viral-activity-level)\n - [ED visits for viral respiratory illness](#cdc_data_surveillance_section_4-ed-visits-for-viral-respiratory-illness)\n - [Epidemic trends](#cdc_data_surveillance_section_5-epidemic-trends)\n - [Data notes](#cdc_data_surveillance_section_7-data-notes)\n - [Explore source data](#cdc_data_surveillance_section_8-explore-source-data)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n Sept. 11, 2026\n\n\n\n\n\n [Sources and Page Info](#content-sources) [Print](#print) [Share](#share)\n\n # # # #\n\n\n\n\n\n\n\n [Facebook](https://www.facebook.com/) [LinkedIn](https://www.linkedin.com/) [Twitter](https://twitter.com/) [Syndicate](https://tools.cdc.gov/medialibrary/index.aspx#[REDACTED])\n\n\n\n\n\n\n\n\n\nContent Source\n\n [National Center for Immunization and Respiratory Diseases (NCIRD)](/ncird/index.html)\n\n\n\n About This Page\n\n\n\n Published: August 14, 2026\n\n\n\n Updated: September 11, 2026\n\nThis page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.\n\n\n\n\n\n Reviewed: September 11, 2026\n\nThe information on this page was last reviewed by subject matter experts to ensure accuracy.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## [** Respiratory Illnesses **](/respiratory-viruses/index.html)\n\n\n\nRespiratory illnesses affect the lungs and airways. Get information on common causes, prevention actions, and current levels of illness in your community.\n\n [View All](/respiratory-viruses/site.html)\n\n\n\n\n\n\n\n\n\n### [For Everyone](/respiratory-viruses/index.html#gen)\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n\n\n\n\n\n\n\n\n\n### [Health Care Providers](/respiratory-viruses/hcp/index.html#hcp)\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n\n\n\n\n\n\n\n### [Public Health](/respiratory-viruses/site.html#php)\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n\n\n\n\n\n\n\n\n\n\n\n ** [Sign up for Email Updates](https://tools.cdc.gov/campaignproxyservice/subscriptions.aspx#[REDACTED]) **\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Contact Us](#contactUs)\n\n\n\n [Contact Us](https://www.cdc.gov/cdc-info/index.html)\n - [Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n\n\n [About CDC](#aboutCDC)\n\n\n\n [About CDC](https://www.cdc.gov/about/)\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n\n\n\n\n\n [Policies](#policies)\n\n\n\n\n\n\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n\n\n\n\n - 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[العربية](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Kreyòl Ayisyen](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n - [Français](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Polski](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Português](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Italiano](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n - [Deutsch](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [日本語](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [فارسی](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [English](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Archive](#archive)\n\n\n\n\n - [CDC Archive](https://archive.cdc.gov/)\n - [Public Health Publications](https://stacks.cdc.gov/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Contact Us](#mobile-footer-contactUs)\n\n [Contact Us](https://www.cdc.gov/cdc-info/index.html)\n - [Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n [About CDC](#mobile-footer-aboutCDC)\n\n\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n - [About CDC](https://www.cdc.gov/about/)\n\n\n\n [Policies](#mobile-footer-policies)\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n - [FOIA](https://www.cdc.gov/foia/)\n - [OIG](https://oig.hhs.gov/)\n - [No Fear Act](https://www.cdc.gov/oeeowe/no-fear-act/)\n - [Nondiscrimination](https://www.cdc.gov/other/nondiscrimination.html)\n - [Vulnerability Disclosure Policy](https://www.hhs.gov/vulnerability-disclosure-policy/index.html)\n\n\n\n [Languages](#mobile-footer-languages)\n\n\n\nLanguages\n\n\n - [Español](https://www.cdc.gov/spanish/)\n\n\n\nLanguage Assistance\n\n\n - [Español](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [繁體中文](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tiếng Việt](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [한국어](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tagalog](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Русский](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [العربية](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Kreyòl Ayisyen](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Français](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Polski](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Português](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Italiano](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Deutsch](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [日本語](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [فارسی](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [English](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n [Archive](#mobile-footer-archive)\n\n\n - [CDC Archive](https://archive.cdc.gov/)\n - [Public Health Publications](https://stacks.cdc.gov/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov/)\n\n\n\n\n\n [**](https://www.facebook.com/CDC) [**](https://twitter.com/CDCgov) [**](https://www.instagram.com/CDCgov) [**](https://www.linkedin.com/company/centers-for-disease-control-and-prevention)\n\n\n\n [**](https://www.youtube.com/cdc) [**](https://www.pinterest.com/cdcgov) [**](https://www.snapchat.com/add/cdcgov) [**](https://www.cdc.gov/rss)\n\n\n\n\n\n\n\n\n\n\n\n [HHS.gov](https://hhs.gov) [USA.gov](https://usa.gov)\n\n\n\n\n\n\n\n\n\n\n\n **",
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"content": "Respiratory Virus Activity Levels | Respiratory Illnesses | CDC\n\n [Skip directly to site content](#content) [Skip directly to search](#cdc-search__input)\n\n\n\n\n\n\n\n\n\n\n\n\n\n  An official website of the United States government\n\n [Here's how you know](#gov-notice)\n\n\n\n\n\n\n\n \n\n **Official websites use .gov**\n\nA **.gov** website belongs to an official government organization in the United States.\n\n\n\n\n\n\n\n \n\n **Secure .gov websites use HTTPS**\n\nA **lock** ( ** ) or **https://** means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n Explore This Topic\n\n Search\n\n Search Clear Search\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [For Everyone](/respiratory-viruses/index.html)\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View all](/respiratory-viruses/site.html#gen)\n\n\n\n\n\n\n\n\n\n [Health Care Providers](/respiratory-viruses/hcp/index.html)\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View all](/respiratory-viruses/site.html#hcp)\n\n\n\n\n\n\n\n\n\n [Public Health](/respiratory-viruses/site.html#php)\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View all](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n ** Related Topics: **\n\n\n\n [COVID-19](/covid/index.html) | [Seasonal Flu](/flu/index.html) | [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n *search*\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html) Menu **\n\n\n\n\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View All](/respiratory-viruses/site.html#gen) [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Health Care Providers\n\n\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View All](/respiratory-viruses/site.html#hcp) [Home](/respiratory-viruses/hcp/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Public Health\n\n\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View All](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n Related Topics\n\n\n\n\n\n\n - [COVID-19](/covid/index.html)\n - [Seasonal Flu](/flu/index.html)\n - [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n \n\n\n\n\n\n\n\n\n\n\n\n [About](/respiratory-viruses/about/index.html) [Risk Factors](/respiratory-viruses/risk-factors/index.html) [Prevention](/respiratory-viruses/prevention/index.html) [Treatment](/respiratory-viruses/treatment/index.html) [Caring for Yourself](/respiratory-viruses/immune-health/index.html) [Data and Trends](/respiratory-viruses/data/index.html) [Communication Resources](/respiratory-viruses/communication-resources/index.html) View Menu\n\n\n\n\n\n\n\n\n\n\n\n# Respiratory Virus Activity Levels\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n Sept. 11, 2026\n\n\n\n [Español](/respiratory-viruses/es/data/niveles-de-actividad.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## What to know\n\n\n\n\n\n\n - CDC tracks respiratory virus activity across the country in several different ways.\n\n - Tracking trends with respiratory viruses using multiple methods helps us spot patterns in a more thorough way.\n\n - Use these pages to get an overall look at respiratory virus illness across the country and in your area.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Summary\n\n\n\n\n\n\n\n\n\n## Level of respiratory virus activity\n\n\n\nCDC tracks respiratory virus activity using a measure called the acute respiratory illness (ARI) metric. ARI is tracked by activity levels, so people can easily compare states and understand how much illness is occurring in their area. ARI includes many types of respiratory illnesses that can lead people to go to the emergency department (ED), including serious infections like [COVID-19](https://www.cdc.gov/covid/index.html),[flu](https://www.cdc.gov/flu/index.html), and [RSV](https://www.cdc.gov/rsv/index.html) disease. Because COVID-19, flu, and RSV are among the most common and serious causes of respiratory illness, they serve as key indicators of overall respiratory virus activity.\n\n\n\n **Tip:** Move your mouse over different areas of the map to see more information about illness levels across the country.\n\n\n\nSelect either **map or trend** below to change views and see more details.\n\n\n\nRefer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more details about the data source.\n\n\n\n\n\n\n\n\n\n## Percent positive tests for respiratory viruses\n\n\n\nTracking the percent of laboratory tests that are positive for SARS-CoV-2 (the virus that causes COVID-19), influenza viruses (flu), and RSV is another method used to check respiratory virus activity. These data can provide useful warnings alongside emergency department (ED) and hospital data. An increase in the **percent of positive** tests means more viruses are spreading in the community.\n\n\n\n**Tip:** move your mouse over the chart for more detailed information. Each virus is represented by a different color, see the key at the top of the graphic. Preliminary data are shaded in gray. For more information on data sources, refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All).\n\n\n\n\n\n\n\n\n\n\n\n## Community viral activity level\n\n\n\nWastewater (sewage) can be tested in the laboratory to detect traces of viruses circulating in a community. It can pick up signs of infection even from people who feel perfectly healthy. Viruses can be found in wastewater that comes from homes and businesses. Because wastewater contains contributions from many places, we cannot identify the exact source of viruses—such as people, livestock, or other animals.\n\n\n\n**Keep Reading** [COVID-19 National Wastewater Data](/nwss/rv/COVID19-national-data.html)\n\n**You** **can select** either COVID-19, Influenza A, or RSV disease to see information about each illness.\n\n\n\n**Tip:** click any area on the map to reveal detailed information about that location. Refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more details about data sources and important information to help you understand how wastewater is used as an early sign of illness.\n\n\n\n* Level based on a small segment (less than 5%) of the population and may not be representative of the state/territory. [Read more »](/respiratory-viruses/data/faqs.html)\n\n\n\n\n\n\n\n## ED visits for viral respiratory illness\n\n\n\n CDC tracks emergency department (ED) visits to quickly understand how a virus is spreading and how sick people are getting. ED data provide timely warnings about whether COVID-19, flu, or RSV disease is increasing or decreasing. CDC tracks the weekly percent of all ED visits associated with COVID-19, flu, and RSV.\n\n\n\nThe weekly percent of total ED visits associated with COVID-19, flu, and RSV are each shown in line charts.\n\n\n\n**Tip:** move your mouse over the chart and you will see information about ED visits for each illness over a certain time. Refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more details.\n\n\n\n\n\n\n\n\n\n## Epidemic trends\n\n\n\nCDC uses data from emergency department visits from previous weeks to model how viruses spread from week to week. This trend is based on a measurement called Rt, the time-based reproduction number, which measures the expected number of people infected by one patient over time.\n\n\n\n*Flu and RSV epidemic trend data updates for the 2025-2026 respiratory illness season ended on May 29, 2026. COVID-19 epidemic trend data will continue to update throughout the summer. We will begin flu and RSV updates for the next respiratory illness season in Fall 2026.*\n\n\n\n**Tip: **you can see the epidemic trends across the country when you** click on different states and territories **on the map to see details**.** Refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for details about the data source.\n\n\n\n\n\n\n\n\n\n\n\n## Data notes\n\n\n\n\n\n\n\n\n\n### Level of respiratory illness activity\n\n\n\n\n\n\n - **Source**: National Syndromic Surveillance Program: [https://www.cdc.gov/nssp/index.html](/nssp/index.html).\n - The acute respiratory illness (ARI) metric categorizes the percentage of emergency department (ED) visits into five activity levels (Very Low, Low, Moderate, High, and Very High), helping people understand the extent of respiratory illness activity in an area. For a list of diagnostic codes for the ARI metric visit: [Acute Respiratory Illness Technical Brief](https://cdn.ymaws.com/www.cste.org/resource/resmgr/pdfs/CDC_Broad_Acute_Respiratory_.pdf).\n\n\n\n#### Methodology for using acute respiratory illness (ARI) as a surveillance metric to describe levels (categories) of emergency department (ED) visits:\n\n\n\nAcute respiratory illness (ARI) is a non-specific syndrome that captures a broad range of diagnoses from emergency department visits for respiratory illnesses, ranging from the common cold to infections that can be severe including COVID-19, influenza, and respiratory syncytial virus (RSV). An ARI-related metric classifies the percentage of ED visits due to ARI into 5 levels (categories): Very Low, Low, Moderate, High, and Very High at the regional, state, and local levels.\n\n\n - For each of the 10 U.S. Department of Health and Human Services Regions separately, we identified the weeks with the lowest activity for respiratory illnesses. This was done using clinical and public health laboratory test positivity data for COVID-19 and RSV from National Respiratory and Enteric Virus Surveillance System (NREVSS), and public health laboratory data from [FluView](https://gis.cdc.gov/grasp/fluview/fluportaldashboard.html), excluding H5, for recent surveillance years (2023-2024, 2024-2025, and 2025-2026 defined as epidemiologic Week 27 through Week 26 of the following calendar year). The lowest activity weeks serve as the reference periods.\n - Lowest activity for COVID-19 and RSV: identified as weeks in a given year when, for at least two consecutive weeks, <1% of tests for COVID-19 and RSV are positive.\n - Lowest activity for influenza: identified as weeks in a given year when, for at least two consecutive weeks, <2% of tests for influenza in those weeks are positive.\n - Week 27 through Week 26 of the following calendar year was used to define a surveillance year in order to capture summer COVID-19 activity as the start of a given season.\n - Lowest activity weeks for ARI were identified as weeks when COVID-19, influenza, and RSV were all identified as having low activity according to their separate thresholds.\n\n\n - For each state within a region, the reference periods were used to calculate the values that created the levels (categories) for the 2026-2027 surveillance year.\n\n\n - First, we calculated the weekly percentage of ED visits attributed to each pathogen and ARI overall within the identified lowest activity periods.\n - Next, we calculated the mean, M, and standard deviation, S, attributed to each pathogen and ARI overall within the identified lowest activity periods. The mean was considered the baseline value for each state and was used as the top value for the Very Low category.\n - Then, we computed the maximum number of standard deviations above the mean for any observed week over all weeks in the three previous seasons (N = (maximum number of standard deviations - M) / S).\n - The maximum number of standard deviations (N) was divided by 4 and multiplied by the standard deviation (S = standard deviation). This value was denoted as D, so D = (N / 4) * S.\n\n\n - Using X = percent of ED visits in a week for each pathogen and ARI overall, we classified activity levels as follows:\n - Very Low: X <= M, activity at or below baseline\n - Low: M < X <= M + D\n - Moderate: M + D < X <= M + 2D\n - High: M + 2D < X <= + 3D\n - Very High: M + 3D < X\n\n\n - **Missouri:** Due to data quality issues, Missouri's historical data before MMWR Week 10 of 2025 (March 2-8, 2025) could not be used for computing levels, thus leaving insufficient data. To address this, data from the rest of HHS Region 7 (Iowa, Kansas, and Nebraska) were used in place of Missouri's own before Week 10 of 2025 to compute the 2026-2027 levels for Missouri; for Week 10 of 2025 and later in the historical baseline years, Missouri's data was used.\n - **Iowa:** Due to a change in HIE vendors, the data feed from Iowa to NSSP was terminated on May 6, 2026. Therefore, only data through the week ending May 2, 2026 is considered and the partial week from May 3 to 9, 2026 is not included. Data and levels for the weeks ending May 9, 2026 and later will show as Data Unavailable.\n\n\n\n#### Hospital service areas (HSAs)\n\n\n\nHSAs were created by CDC's National Center for Health Statistics (NCHS) in 1996. An HSA is an area that is relatively self-contained with respect to hospital care. There are 949 HSAs. HSAs can vary in size, encompassing a single city, a county or a larger region within a state. Areas with higher population concentrations may have smaller HSAs to ensure adequate healthcare access, while sparsely populated regions might have larger HSAs that cover a broader geographical area. The National Institutes of Health National Cancer Institute (NCI) modified the HSA designations so that any HSA that crossed state or Surveillance, Epidemiology, and End Results (SEER) Registry boundaries was split so that all counties from one HSA were in one state and/or SEER Registry. The NCI SEER dataset can be accessed here: [Health Service Areas (HSA) - SEER Datasets (cancer.gov)](https://seer.cancer.gov/seerstat/variables/countyattribs/hsa.html)\n\n\n\n#### Display criteria for sub-state levels (categories)\n\n\n - Jurisdictions may elect not to display sub-state ED visit data for a variety of reasons.\n - Data from HSAs with fewer than 30% of hospitals participating in NSSP are suppressed to ensure a minimum level of representativeness.\n - Sub-state display of levels (categories) is further limited to ensure that calculations are stable and based on having a sufficient number of total ED visits. For each state, a minimum number of total ED visits (V) is defined as V = 1/D, where D = maximum number of standard deviations above the mean for any observed week divided by 4 (see above). This value of V is determined separately for COVID-19, influenza, RSV, and ARI overall for each state.\n - To assess if an HSA meets the criteria for classification based on sufficient data, data weeks from Week 1 to Week 26 of 2026 were considered. If the total number of ED visits in an HSA during these weeks was equal to or greater than the corresponding V value, it indicated sufficient data. However, if the total number of weeks meeting this minimum count fell below 80% (21 out of 26 weeks), the level (category) was not displayed for that HSA in any week. The percentage of ED visits for COVID-19, influenza, or RSV may still be displayed even if the level (category) is not displayed.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Percent of positive tests for viral respiratory pathogens\n\n\n\n\n\n\n - **Sources**: COVID-19 and RSV: National Respiratory and Enteric Virus Surveillance System ([NREVSS](/nrevss/php/dashboard/index.html)), a sentinel network of laboratories located through the US, includes clinical, public health and commercial laboratories. Flu: Clinical laboratory test results from NREVSS and flu collaborating laboratories; more details about [influenza virologic surveillance](/fluview/overview) are available.\n\n\n\n\nData is preliminary and may change as more reports are received. The most recent 3 weeks in gray are more likely to change because of delays in reporting. Data represents laboratory tests performed, not individual people. The data are reported across the country in all regions.\n\n\n\nThe percent of positive tests is calculated by dividing the number of positive tests by the total number of tests given, then multiplying by 100 [(# of positive tests/total tests) x 100].\n\n\n\nRSV and COVID-19 are limited to nucleic acid amplification tests (NAATs), also listed as polymerase chain rection tests (PCR). Participating laboratories report weekly to CDC the total number of COVID-19, flu, and RSV tests performed that week and the number of those tests that were positive.\n\n\n - COVID-19 laboratory data is available for [download](https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-COVID-19-Nucleic-Acid-Amplif/gvsb-yw6g/about_data).\n - RSV laboratory data are available for [download](https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-Respiratory-Syncytial-Virus-/3cxc-4k8q/about_data).\n - Flu laboratory data are available for [download](https://www.cdc.gov/fluview/overview/fluview-interactive.html?CDC_AAref_Val=%5BREDACTED%5D).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Wastewater viral activity level\n\n\n\n\n\n\n\nThe map shows the Wastewater Viral Activity Level across US states and territories. Activity levels indicate how much virus is currently detected in the wastewater – ranging from very low to very high. Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing, and before people who are sick go to their healthcare provider or hospital. It can also detect infections in people without symptoms. For more information, see [Data Methods](https://www.cdc.gov/wastewater/about-data/index.html).\n\n\n\nData representing less than 5% of the population has a hatching, or lined, pattern on the map, indicating the wastewater viral activity level may not show the full picture for that state or territory. States or territories without sufficient data are indicated as \"No data\". This can be because data was not reported from the state or territory, or the monitored sites do not have enough data to calculate the wastewater viral activity level.\n\n\n\nWastewater data will not include waste that may be disposed of outside the wastewater system, such as dirty diapers.\n\n\n\n#### Data limitations for flu A\n\n\n\nWastewater data cannot determine the source of flu A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow). Wastewater testing for flu displayed in these visuals only detects flu A viruses and does not distinguish between flu A subtypes (seasonal flu A[H1N1] virus, seasonal flu A[H3N2] virus and avian flu A[H5] virus).\n\n\n\nFor more data limitations, see [Data Methods](https://www.cdc.gov/nwss/about-data.html#[REDACTED]).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### ED visits for viral respiratory illness\n\n\n\n\n\n\n\nSource: National Syndromic Surveillance Program: [https://www.cdc.gov/nssp/index.html](https://www.cdc.gov/nssp/index.html)\n\n\n\nThere are no data available for the following states/territories: Guam and South Dakota. for additional information, you can read [Companion Guide: NSSP Emergency Department Data on Respiratory Illness](https://archive.cdc.gov/www_cdc_gov/ncird/surveillance/respiratory-illnesses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Epidemic trends\n\n\n\n\n\n\n\nSource: The Center for Forecasting and Outbreak Analytics: [Current Epidemic Trends (Based on Rt) for States](https://www.cdc.gov/cfa-modeling-and-forecasting/rt-estimates/index.html).\n\n\n\nThe epidemic trend is based on *Rt*, the time-varying reproductive number. *Rt *measures disease transmission. If *Rt *is above 1, the number of infections is growing because, on average, each infected person is causing more than one new infection; if *Rt *is below 1, it indicates that infections are declining. *Rt *is estimated using data on ED visits reported through the [National Syndromic Surveillance Program (NSSP](https://www.cdc.gov/nssp/index.html)).\n\n\n\nThe map's color coding reflects whether infections are likely to increase or decrease:\n\n\n - Dark purple: Infections are growing\n - Purple: Infections are likely growing\n - Gray: Infections are likely not changing\n - Green: Infections are likely declining\n - Dark green: Infections are declining\n\n\n\nThe accuracy of *Rt *can be temporarily affected by changes in how many people with infections go to EDs, for example a new variant or strain emerges that causes more severe disease, and by changes in testing or reporting practices. The data used to estimate *Rt *are updated frequently, and initially reported counts might later be revised. The data are manually reviewed each week, and extreme or unexpected values that appear unreliable are not included.\n\n\n\n*Rt is* not estimated for states in the following cases:\n\n\n - Jurisdictions with low ED facility participation or where diagnosis information is incomplete\n - Fewer than 10 ED visits for the disease were reported in the prior 2 weeks\n - Anomalies were detected in reported values\n - The model did not pass checks for reliability\n\n\n\nFor additional methods: [Behind the Model: CDC's Tools to Assess Epidemic Trends | CFA: Behind the Model | CDC](https://www.cdc.gov/cfa-behind-the-model/php/data-research/rt-estimates/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Explore source data\n\n\n - [State Map of Outpatient Respiratory Illness Activity](https://gis.cdc.gov/grasp/fluview/main.html)\n - [Outpatient Illness and Viral Surveillance](https://gis.cdc.gov/grasp/fluview/fluportaldashboard.html)\n - [COVID-19 Testing, Hospitalization, and Death Trends](https://covid.cdc.gov/covid-data-tracker/#[REDACTED])\n - [Weekly U.S. Influenza Surveillance Report](https://www.cdc.gov/fluview/index.html)\n - [Current Wastewater Viral Activity Level](https://www.cdc.gov/nwss/index.html)\n\n\n\n\n\n\n\n\n\n\n\n## On This Page\n\n\n\n\n - [Summary](#cdc_data_surveillance_section_1-summary)\n - [Level of respiratory virus activity](#cdc_data_surveillance_section_2-level-of-respiratory-virus-activity)\n - [Percent positive tests for respiratory viruses](#cdc_data_surveillance_section_6-percent-positive-tests-for-respiratory-viruses)\n - [Community viral activity level](#cdc_data_surveillance_section_3-community-viral-activity-level)\n - [ED visits for viral respiratory illness](#cdc_data_surveillance_section_4-ed-visits-for-viral-respiratory-illness)\n - [Epidemic trends](#cdc_data_surveillance_section_5-epidemic-trends)\n - [Data notes](#cdc_data_surveillance_section_7-data-notes)\n - [Explore source data](#cdc_data_surveillance_section_8-explore-source-data)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n Sept. 11, 2026\n\n\n\n\n\n [Sources and Page Info](#content-sources) [Print](#print) [Share](#share)\n\n # # # #\n\n\n\n\n\n\n\n [Facebook](https://www.facebook.com/) [LinkedIn](https://www.linkedin.com/) [Twitter](https://twitter.com/) [Syndicate](https://tools.cdc.gov/medialibrary/index.aspx#[REDACTED])\n\n\n\n\n\n\n\n\n\nContent Source\n\n [National Center for Immunization and Respiratory Diseases (NCIRD)](/ncird/index.html)\n\n\n\n About This Page\n\n\n\n Published: August 14, 2026\n\n\n\n Updated: September 11, 2026\n\nThis page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.\n\n\n\n\n\n Reviewed: September 11, 2026\n\nThe information on this page was last reviewed by subject matter experts to ensure accuracy.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## [** Respiratory Illnesses **](/respiratory-viruses/index.html)\n\n\n\nRespiratory illnesses affect the lungs and airways. 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"content": "Severe Viral Respiratory Illness | Respiratory Illnesses | CDC\n\n [Skip directly to site content](#content) [Skip directly to search](#cdc-search__input)\n\n\n\n\n\n\n\n\n\n\n\n\n\n  An official website of the United States government\n\n [Here's how you know](#gov-notice)\n\n\n\n\n\n\n\n \n\n **Official websites use .gov**\n\nA **.gov** website belongs to an official government organization in the United States.\n\n\n\n\n\n\n\n \n\n **Secure .gov websites use HTTPS**\n\nA **lock** ( ** ) or **https://** means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n Explore This Topic\n\n Search\n\n Search Clear Search\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [For Everyone](/respiratory-viruses/index.html)\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View all](/respiratory-viruses/site.html#gen)\n\n\n\n\n\n\n\n\n\n [Health Care Providers](/respiratory-viruses/hcp/index.html)\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View all](/respiratory-viruses/site.html#hcp)\n\n\n\n\n\n\n\n\n\n [Public Health](/respiratory-viruses/site.html#php)\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View all](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n ** Related Topics: **\n\n\n\n [COVID-19](/covid/index.html) | [Seasonal Flu](/flu/index.html) | [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n *search*\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html) Menu **\n\n\n\n\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View All](/respiratory-viruses/site.html#gen) [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Health Care Providers\n\n\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View All](/respiratory-viruses/site.html#hcp) [Home](/respiratory-viruses/hcp/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Public Health\n\n\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View All](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n Related Topics\n\n\n\n\n\n\n - [COVID-19](/covid/index.html)\n - [Seasonal Flu](/flu/index.html)\n - [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n \n\n\n\n\n\n\n\n\n\n\n\n [About](/respiratory-viruses/about/index.html) [Risk Factors](/respiratory-viruses/risk-factors/index.html) [Prevention](/respiratory-viruses/prevention/index.html) [Treatment](/respiratory-viruses/treatment/index.html) [Caring for Yourself](/respiratory-viruses/immune-health/index.html) [Data and Trends](/respiratory-viruses/data/index.html) [Communication Resources](/respiratory-viruses/communication-resources/index.html) View Menu\n\n\n\n\n\n\n\n\n\n\n\n# Severe Viral Respiratory Illness\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n Sept. 11, 2026\n\n\n\n [Español](/respiratory-viruses/es/data/gravedad.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## At a glance\n\n\n\n\n\n\n - See how severe respiratory illnesses are by reviewing the latest data on hospitalizations and deaths caused by respiratory viruses.\n - Understand how illness severity is changing by tracking trends in your state and nationwide.\n - Discover why these numbers matter; understanding the impact helps you make informed decisions to protect yourself and your family.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Summary\n\n\n\n\n\n\n\n\n\n## Hospitalization numbers\n\n\n\nThis website displays two sources of hospitalization data. The first source is the [CDC's National Healthcare Safety Network](https://www.cdc.gov/nhsn/psc/hospital-respiratory-reporting.html) (NHSN) and the second is [CDC's Respiratory Virus Hospitalization Surveillance Network](/resp-net/dashboard/index.html) (RESP-NET).\n\n\n\n### Hospital admission levels\n\n\n\nCDC monitors the number of hospital admissions for [COVID-19](/covid/index.html), [influenza](/flu/index.html) (flu), and [RSV](/rsv/index.html). The color bar at the top of the map shows the hospitalization level associated with each color. **Click on the tab for COVID-19, influenza, or RSV to see the levels for each disease. Hover over a state to see the levels and additional details**. Refer to [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more information about data sources.\n\n\n\n### Hospitalization rates reported by hospitals\n\n\n\nCDC tracks the weekly hospitalization rate of respiratory virus-associated hospitalizations per 100,000 people reported to [CDC's National Healthcare Safety Network](https://www.cdc.gov/nhsn/psc/hospital-respiratory-reporting.html) (NHSN). Forecasts of future emergency department visits and hospital admissions are available for [COVID-19](https://www.cdc.gov/cfa-modeling-and-forecasting/covid19-data-vis/index.html?tab=%5BREDACTED%5D), [influenza](https://www.cdc.gov/flu-forecasting/data-vis/current-week.html), and [RSV](https://www.cdc.gov/cfa-modeling-and-forecasting/rsv-data-vis/index.html?tab=%5BREDACTED%5D).\n\n\n\n**Click the drop down at the top of the chart to select the geographic area you are interested in.** **You can move your mouse over the graph to view additional details.** Information about each respiratory illness is in a different color. *Open circles indicate fewer than 80% of hospitals in that area have reported illness numbers.*\n\n\n\nPreliminary data are shaded in gray. Refer to [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more information about data sources.\n\n\n\n\n\n### Hospitalization rates from a network of hospitals\n\n\n\nBelow, you'll find the weekly hospitalization rates of respiratory virus-associated hospitalizations per 100,000 people from [RESP-NET](/resp-net/dashboard/).\n\n\n\n**Click the box at the top of the chart** to see information about different states or territories. Information about each respiratory illness is in a different color. **Move your mouse over the chart and more information for each week will appear**. Because reporting may be delayed, models estimate what rates would be if all data were complete. Modeled median estimates are shown with dashed lines. Refer to [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more about data sources.\n\n\n\n\n\n\n\n\n\n\n\n## Viral respiratory deaths in the United States\n\n\n\nThe chart below shows the weekly percentages of total deaths associated with COVID-19, influenza (flu), and RSV. Each respiratory illness is in a different color. **Move your mouse over the chart and more information for each week will appear.** Data from some recent weeks may be incomplete because of reporting delays; these weeks are shaded gray. For more information about the data source, refer to the [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All).\n\n\n\n\n\n\n\n\n\n## Data notes\n\n\n\n\n\n\n\n\n\n### Hospitalization rates: NHSN\n\n\n\n\n\n\n - **SOURCE: **National Healthcare Safety Network (NHSN)\n\n\n - **Data source description**: As of November 1, 2024, Hospital Respiratory Data (HRD; formerly Respiratory Pathogen, Hospital Capacity, and Supply data or 'COVID-19 hospital data') are required to be reported to HHS through CDC's NHSN based on updated requirements from the Centers for Medicare and Medicaid Services (CMS). NHSN monitors national and local trends in healthcare system stress and capacity for all acute care and critical access hospitals in the United States. Data reported by hospitals to NHSN represent aggregated counts and include metrics capturing information specific to hospital capacity, occupancy, hospitalizations, and admissions. Find more information about [reporting to NHSN](/nhsn/psc/hospital-respiratory-reporting.html).\n - **Data quality and timeliness: **CDC reviews reported data for completeness and errors and works with partners to update the data as needed. Data for the most recent two weeks may be affected by potential reporting delays; caution should be taken when interpreting these numbers.\n - **Metrics and inclusion criteria: **Many hospital types, including acute care and critical access hospitals, are included in the hospitalization rate and level calculations displayed on this page. Psychiatric, rehabilitation, and religious non-medical hospital types are excluded from calculations. Hospitals that report hospital admissions data for the entire week to NHSN during a given reporting week of Sunday through Saturday, are included in the jurisdiction admissions rate calculations and the accompanying visualizations.\n - **Respiratory virus-associated hospitalization rates** are calculated as the total number of new hospital admissions reported to NHSN for a given reporting week (Sunday – Saturday) divided by the total population for a given geography (per 100,000 people) according to the U.S. Census 2023 population estimates.\n - **Hospital admission levels** are determined based on the respiratory virus-associated hospitalization rates. The map shows the hospital admissions level for states and territories in the United States. This metric indicates whether the amount of people being admitted to the hospital for respiratory illnesses is very low, low, moderate, high, or very high for a given jurisdiction and reporting week (Sunday - Saturday). If you see increased hospital admission levels of COVID-19, flu, or RSV, it might indicate there is a higher risk of infection. For more information on the hospital admissions levels, see [NHSN hospital admissions methodology](/nhsn/psc/hospital-respiratory-reporting/data-methods.html).\n - **Percent of hospitals** **reporting **is calculated based on the number of hospitals reporting complete hospital admissions data (e.g., total admissions for the entire week) to NHSN for a given reporting week out of all hospitals that have reported to the system since the implementation of NHSN Hospital Respiratory Data in November 2024 (excluding the types listed above). Open circles on the time series display and hashed lines on the map display indicate less than 80% of hospitals reported numbers for a given jurisdiction in a reporting week. States or territories without sufficient data (less than 80% of hospitals reporting) are indicated as \"Data unavailable”.\n - The NHSN-based hospital bed occupancy from January 2022 to May 2024 was archived on May 10, 2024; it can be found at [Archived: Hospital Occupancy (cdc.gov)](https://archive.cdc.gov/www_cdc_gov/respiratory-viruses/data-research/dashboard/hospital-occupancy.html)[.](https://archive.cdc.gov/www_cdc_gov/respiratory-viruses/data-research/dashboard/hospital-occupancy.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Hospitalization rates: RESP-NET\n\n\n\n\n\n\n - **SOURCE:** Respiratory Virus Hospitalization Surveillance Network (RESP-NET).\n - Combined is the sum of COVID-19, flu, and respiratory syncytial virus (RSV) hospitalization rates.\n - Additional information, including the surveillance catchment area, is available on the [RESP-NET website](/resp-net/dashboard/index.html).\n - Hospitalization rates are calculated using the National Center for Health Statistics (NCHS) vintage bridged-race postcensal population estimates (for March–September 2020) or the U.S. Census vintage unbridged-race postcensal population estimates (for October 2020–present) for the counties or county equivalents included in the surveillance area.\n - RESP-NET surveillance for COVID-19 and RSV have been conducted year-round since 2020.\n - FluSurv-NET surveillance was traditionally conducted from October 1 through April 30 of the following year; however, starting with the 2025-26 season it will be conducted year-round.\n - Rates are likely to underestimate the impact of COVID-19, flu, and RSV on hospitalizations because of undertesting, differing provider or facility testing practices, and diagnostic test sensitivity. Rates presented do not adjust for testing practices which may differ by pathogen, age, race and ethnicity, and other demographic criteria.\n - The data points for the 3 most recent weeks of data represent estimates of the RESP-NET hospitalization rates, called \"[nowcasts](https://www.cdc.gov/cfa-behind-the-model/php/data-research/nowcasting.html),\" which are model-based estimates that account for delayed reporting of recent hospitalizations to estimate the RESP-NET rates from the partial data received so far. Observed data values, estimated ranges, and additional details about the model estimation are available on the [RESP-NET website](/resp-net/dashboard/index.html).\n - Because population estimates for ages 0–1 year are not available in smaller groupings, we split that number in two to estimate the populations for children younger than 6 months and for children 6 to less than 12 months.\n - Black, White, American Indian/Alaska Native, and Asian/Pacific Islander people were categorized as non-Hispanic; Hispanic people could be of any race. If Hispanic ethnicity was unknown, non-Hispanic ethnicity was assumed. Rates presented by race and ethnicity are calculated using records with known races. Those with missing or unknown race are excluded from race-specific estimates but are included in overall estimates.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Viral respiratory deaths\n\n\n\n\n\n\n - **SOURCE:** Provisional Deaths from the CDC's National Center for Health Statistics (NCHS) National Vital Statistics System (NVSS). Accessed from [CDC Wonder](https://wonder.cdc.gov/mcd-icd10-provisional.html).\n - Provisional data are non-final counts of deaths based on mortality data in NVSS. Data during recent periods are incomplete because of the gap in time between when a death occurs and when a death certificate is completed, submitted to NCHS, and processed for reporting. This delay can range from 1 week to 8 weeks or more, depending on the jurisdiction.\n - Definitions: When a person dies, the underlying and contributing causes are recorded in the form of ICD-10 codes. Cause-specific death counts are defined as those deaths with the designated ICD-10. In this case, the ICD-10 code definitions are as follows: COVID-19 (U07.1), flu (J09-J11), RSV (J12.1, J20.5, J21.0).\n - The death certificate data presented here provide a timely understanding of trends in deaths associated with each condition. However, it has been long recognized that only counting deaths where flu was recorded on death certificates would [underestimate flu's overall impact on mortality](/flu-burden/php/about/how-cdc-estimates.html). Flu can lead to death from other causes, such as pneumonia and congestive heart failure; however, it may not be listed on the death certificate as a contributing cause for multiple reasons, including a lack of testing. Therefore, CDC has an established history of using models to [estimate influenza-associated death totals](/flu-burden/php/data-vis/). In the fall of 2024, CDC released [COVID-19](/covid/php/surveillance/burden-estimates.html) and [RSV](https://www.cdc.gov/rsv/php/surveillance/burden-estimates.html) estimated death totals.\n - Death data are displayed by date of death. Death data reported are based on the total number of deaths received and coded in a certain time period and may not represent all deaths that occurred in that period. Death counts are updated as additional data are received.\n - Percent of deaths is not presented for weeks where death counts are between 1-9 in accordance with NCHS data confidentiality standards.\n - Provisional death data represent deaths among U.S. residents and occurring in the 50 states, plus the District of Columbia. Assignment to a geographic area is based on the place of residence listed on the death certificate.\n - The percentage of all reported deaths that are attributed as COVID-19, flu, and RSV is calculated as the number of COVID-19, flu, and RSV deaths divided by the number of deaths from all causes multiplied by 100. The percentage of deaths is less affected by incomplete reporting in recent weeks because death certificate data from natural causes of death and all causes have similar timeliness.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Explore source data\n\n\n - [RESP-NET Respiratory Virus Hospitalizations Dashboard](/resp-net/dashboard/index.html)\n - [NHSN Hospital Respiratory Data Dashboard](/nhsn/psc/hospital-respiratory-dashboard.html)\n - [Influenza Hospitalizations Dashboards](https://gis.cdc.gov/GRASP/Fluview/FluHospRates.html)\n - [RSV Hospitalizations Dashboard](/rsv/php/surveillance/rsv-net.html)\n - [Estimates of COVID-19 Burden](/covid/php/surveillance/burden-estimates.html)\n - [COVID-19 Death Data](/nchs/nvss/vsrr/COVID19/index.htm)\n\n\n\n\n\n\n\n\n\n\n\n## On This Page\n\n\n\n\n - [Summary](#cdc_data_surveillance_section_1-summary)\n - [Hospitalization numbers](#cdc_data_surveillance_section_2-hospitalization-numbers)\n - [Viral respiratory deaths in the United States](#cdc_data_surveillance_section_3-viral-respiratory-deaths-in-the-united-states)\n - [Data notes](#cdc_data_surveillance_section_4-data-notes)\n - [Explore source data](#cdc_data_surveillance_section_5-explore-source-data)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n Sept. 11, 2026\n\n\n\n\n\n [Sources and Page Info](#content-sources) [Print](#print) [Share](#share)\n\n # # # #\n\n\n\n\n\n\n\n [Facebook](https://www.facebook.com/) [LinkedIn](https://www.linkedin.com/) [Twitter](https://twitter.com/) [Syndicate](https://tools.cdc.gov/medialibrary/index.aspx#[REDACTED])\n\n\n\n\n\n\n\n\n\nContent Source\n\n [National Center for Immunization and Respiratory Diseases (NCIRD)](/ncird/index.html)\n\n\n\n About This Page\n\n\n\n Published: April 24, 2026\n\n\n\n Updated: September 11, 2026\n\nThis page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.\n\n\n\n\n\n Reviewed: September 11, 2026\n\nThe information on this page was last reviewed by subject matter experts to ensure accuracy.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## [** Respiratory Illnesses **](/respiratory-viruses/index.html)\n\n\n\nRespiratory illnesses affect the lungs and airways. Get information on common causes, prevention actions, and current levels of illness in your community.\n\n [View All](/respiratory-viruses/site.html)\n\n\n\n\n\n\n\n\n\n### [For Everyone](/respiratory-viruses/index.html#gen)\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n\n\n\n\n\n\n\n\n\n### [Health Care Providers](/respiratory-viruses/hcp/index.html#hcp)\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n\n\n\n\n\n\n\n### [Public Health](/respiratory-viruses/site.html#php)\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n\n\n\n\n\n\n\n\n\n\n\n ** [Sign up for Email Updates](https://tools.cdc.gov/campaignproxyservice/subscriptions.aspx#[REDACTED]) **\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Contact Us](#contactUs)\n\n\n\n [Contact Us](https://www.cdc.gov/cdc-info/index.html)\n - [Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n\n\n [About CDC](#aboutCDC)\n\n\n\n [About CDC](https://www.cdc.gov/about/)\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n\n\n\n\n\n [Policies](#policies)\n\n\n\n\n\n\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n\n\n\n\n - 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[العربية](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Kreyòl Ayisyen](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n - [Français](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Polski](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Português](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Italiano](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n - [Deutsch](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [日本語](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [فارسی](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [English](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Archive](#archive)\n\n\n\n\n - [CDC Archive](https://archive.cdc.gov/)\n - [Public Health Publications](https://stacks.cdc.gov/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Contact Us](#mobile-footer-contactUs)\n\n [Contact Us](https://www.cdc.gov/cdc-info/index.html)\n - [Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n [About CDC](#mobile-footer-aboutCDC)\n\n\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n - [About CDC](https://www.cdc.gov/about/)\n\n\n\n [Policies](#mobile-footer-policies)\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n - [FOIA](https://www.cdc.gov/foia/)\n - [OIG](https://oig.hhs.gov/)\n - [No Fear Act](https://www.cdc.gov/oeeowe/no-fear-act/)\n - [Nondiscrimination](https://www.cdc.gov/other/nondiscrimination.html)\n - [Vulnerability Disclosure Policy](https://www.hhs.gov/vulnerability-disclosure-policy/index.html)\n\n\n\n [Languages](#mobile-footer-languages)\n\n\n\nLanguages\n\n\n - [Español](https://www.cdc.gov/spanish/)\n\n\n\nLanguage Assistance\n\n\n - [Español](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [繁體中文](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tiếng Việt](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [한국어](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tagalog](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Русский](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [العربية](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Kreyòl Ayisyen](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Français](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Polski](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Português](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Italiano](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Deutsch](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [日本語](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [فارسی](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [English](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n [Archive](#mobile-footer-archive)\n\n\n - [CDC Archive](https://archive.cdc.gov/)\n - [Public Health Publications](https://stacks.cdc.gov/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov/)\n\n\n\n\n\n [**](https://www.facebook.com/CDC) [**](https://twitter.com/CDCgov) [**](https://www.instagram.com/CDCgov) [**](https://www.linkedin.com/company/centers-for-disease-control-and-prevention)\n\n\n\n [**](https://www.youtube.com/cdc) [**](https://www.pinterest.com/cdcgov) [**](https://www.snapchat.com/add/cdcgov) [**](https://www.cdc.gov/rss)\n\n\n\n\n\n\n\n\n\n\n\n [HHS.gov](https://hhs.gov) [USA.gov](https://usa.gov)\n\n\n\n\n\n\n\n\n\n\n\n **",
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"content": "Severe Viral Respiratory Illness | Respiratory Illnesses | CDC\n\n [Skip directly to site content](#content) [Skip directly to search](#cdc-search__input)\n\n\n\n\n\n\n\n\n\n\n\n\n\n  An official website of the United States government\n\n [Here's how you know](#gov-notice)\n\n\n\n\n\n\n\n \n\n **Official websites use .gov**\n\nA **.gov** website belongs to an official government organization in the United States.\n\n\n\n\n\n\n\n \n\n **Secure .gov websites use HTTPS**\n\nA **lock** ( ** ) or **https://** means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n Explore This Topic\n\n Search\n\n Search Clear Search\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [For Everyone](/respiratory-viruses/index.html)\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View all](/respiratory-viruses/site.html#gen)\n\n\n\n\n\n\n\n\n\n [Health Care Providers](/respiratory-viruses/hcp/index.html)\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View all](/respiratory-viruses/site.html#hcp)\n\n\n\n\n\n\n\n\n\n [Public Health](/respiratory-viruses/site.html#php)\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View all](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n ** Related Topics: **\n\n\n\n [COVID-19](/covid/index.html) | [Seasonal Flu](/flu/index.html) | [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n *search*\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html) Menu **\n\n\n\n\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View All](/respiratory-viruses/site.html#gen) [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Health Care Providers\n\n\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View All](/respiratory-viruses/site.html#hcp) [Home](/respiratory-viruses/hcp/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Public Health\n\n\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View All](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n Related Topics\n\n\n\n\n\n\n - [COVID-19](/covid/index.html)\n - [Seasonal Flu](/flu/index.html)\n - [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n \n\n\n\n\n\n\n\n\n\n\n\n [About](/respiratory-viruses/about/index.html) [Risk Factors](/respiratory-viruses/risk-factors/index.html) [Prevention](/respiratory-viruses/prevention/index.html) [Treatment](/respiratory-viruses/treatment/index.html) [Caring for Yourself](/respiratory-viruses/immune-health/index.html) [Data and Trends](/respiratory-viruses/data/index.html) [Communication Resources](/respiratory-viruses/communication-resources/index.html) View Menu\n\n\n\n\n\n\n\n\n\n\n\n# Severe Viral Respiratory Illness\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n Sept. 11, 2026\n\n\n\n [Español](/respiratory-viruses/es/data/gravedad.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## At a glance\n\n\n\n\n\n\n - See how severe respiratory illnesses are by reviewing the latest data on hospitalizations and deaths caused by respiratory viruses.\n - Understand how illness severity is changing by tracking trends in your state and nationwide.\n - Discover why these numbers matter; understanding the impact helps you make informed decisions to protect yourself and your family.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Summary\n\n\n\n\n\n\n\n\n\n## Hospitalization numbers\n\n\n\nThis website displays two sources of hospitalization data. The first source is the [CDC's National Healthcare Safety Network](https://www.cdc.gov/nhsn/psc/hospital-respiratory-reporting.html) (NHSN) and the second is [CDC's Respiratory Virus Hospitalization Surveillance Network](/resp-net/dashboard/index.html) (RESP-NET).\n\n\n\n### Hospital admission levels\n\n\n\nCDC monitors the number of hospital admissions for [COVID-19](/covid/index.html), [influenza](/flu/index.html) (flu), and [RSV](/rsv/index.html). The color bar at the top of the map shows the hospitalization level associated with each color. **Click on the tab for COVID-19, influenza, or RSV to see the levels for each disease. Hover over a state to see the levels and additional details**. Refer to [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more information about data sources.\n\n\n\n### Hospitalization rates reported by hospitals\n\n\n\nCDC tracks the weekly hospitalization rate of respiratory virus-associated hospitalizations per 100,000 people reported to [CDC's National Healthcare Safety Network](https://www.cdc.gov/nhsn/psc/hospital-respiratory-reporting.html) (NHSN). Forecasts of future emergency department visits and hospital admissions are available for [COVID-19](https://www.cdc.gov/cfa-modeling-and-forecasting/covid19-data-vis/index.html?tab=%5BREDACTED%5D), [influenza](https://www.cdc.gov/flu-forecasting/data-vis/current-week.html), and [RSV](https://www.cdc.gov/cfa-modeling-and-forecasting/rsv-data-vis/index.html?tab=%5BREDACTED%5D).\n\n\n\n**Click the drop down at the top of the chart to select the geographic area you are interested in.** **You can move your mouse over the graph to view additional details.** Information about each respiratory illness is in a different color. *Open circles indicate fewer than 80% of hospitals in that area have reported illness numbers.*\n\n\n\nPreliminary data are shaded in gray. Refer to [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more information about data sources.\n\n\n\n\n\n### Hospitalization rates from a network of hospitals\n\n\n\nBelow, you'll find the weekly hospitalization rates of respiratory virus-associated hospitalizations per 100,000 people from [RESP-NET](/resp-net/dashboard/).\n\n\n\n**Click the box at the top of the chart** to see information about different states or territories. Information about each respiratory illness is in a different color. **Move your mouse over the chart and more information for each week will appear**. Because reporting may be delayed, models estimate what rates would be if all data were complete. Modeled median estimates are shown with dashed lines. Refer to [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more about data sources.\n\n\n\n\n\n\n\n\n\n\n\n## Viral respiratory deaths in the United States\n\n\n\nThe chart below shows the weekly percentages of total deaths associated with COVID-19, influenza (flu), and RSV. Each respiratory illness is in a different color. **Move your mouse over the chart and more information for each week will appear.** Data from some recent weeks may be incomplete because of reporting delays; these weeks are shaded gray. For more information about the data source, refer to the [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All).\n\n\n\n\n\n\n\n\n\n## Data notes\n\n\n\n\n\n\n\n\n\n### Hospitalization rates: NHSN\n\n\n\n\n\n\n - **SOURCE: **National Healthcare Safety Network (NHSN)\n\n\n - **Data source description**: As of November 1, 2024, Hospital Respiratory Data (HRD; formerly Respiratory Pathogen, Hospital Capacity, and Supply data or 'COVID-19 hospital data') are required to be reported to HHS through CDC's NHSN based on updated requirements from the Centers for Medicare and Medicaid Services (CMS). NHSN monitors national and local trends in healthcare system stress and capacity for all acute care and critical access hospitals in the United States. Data reported by hospitals to NHSN represent aggregated counts and include metrics capturing information specific to hospital capacity, occupancy, hospitalizations, and admissions. Find more information about [reporting to NHSN](/nhsn/psc/hospital-respiratory-reporting.html).\n - **Data quality and timeliness: **CDC reviews reported data for completeness and errors and works with partners to update the data as needed. Data for the most recent two weeks may be affected by potential reporting delays; caution should be taken when interpreting these numbers.\n - **Metrics and inclusion criteria: **Many hospital types, including acute care and critical access hospitals, are included in the hospitalization rate and level calculations displayed on this page. Psychiatric, rehabilitation, and religious non-medical hospital types are excluded from calculations. Hospitals that report hospital admissions data for the entire week to NHSN during a given reporting week of Sunday through Saturday, are included in the jurisdiction admissions rate calculations and the accompanying visualizations.\n - **Respiratory virus-associated hospitalization rates** are calculated as the total number of new hospital admissions reported to NHSN for a given reporting week (Sunday – Saturday) divided by the total population for a given geography (per 100,000 people) according to the U.S. Census 2023 population estimates.\n - **Hospital admission levels** are determined based on the respiratory virus-associated hospitalization rates. The map shows the hospital admissions level for states and territories in the United States. This metric indicates whether the amount of people being admitted to the hospital for respiratory illnesses is very low, low, moderate, high, or very high for a given jurisdiction and reporting week (Sunday - Saturday). If you see increased hospital admission levels of COVID-19, flu, or RSV, it might indicate there is a higher risk of infection. For more information on the hospital admissions levels, see [NHSN hospital admissions methodology](/nhsn/psc/hospital-respiratory-reporting/data-methods.html).\n - **Percent of hospitals** **reporting **is calculated based on the number of hospitals reporting complete hospital admissions data (e.g., total admissions for the entire week) to NHSN for a given reporting week out of all hospitals that have reported to the system since the implementation of NHSN Hospital Respiratory Data in November 2024 (excluding the types listed above). Open circles on the time series display and hashed lines on the map display indicate less than 80% of hospitals reported numbers for a given jurisdiction in a reporting week. States or territories without sufficient data (less than 80% of hospitals reporting) are indicated as \"Data unavailable”.\n - The NHSN-based hospital bed occupancy from January 2022 to May 2024 was archived on May 10, 2024; it can be found at [Archived: Hospital Occupancy (cdc.gov)](https://archive.cdc.gov/www_cdc_gov/respiratory-viruses/data-research/dashboard/hospital-occupancy.html)[.](https://archive.cdc.gov/www_cdc_gov/respiratory-viruses/data-research/dashboard/hospital-occupancy.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Hospitalization rates: RESP-NET\n\n\n\n\n\n\n - **SOURCE:** Respiratory Virus Hospitalization Surveillance Network (RESP-NET).\n - Combined is the sum of COVID-19, flu, and respiratory syncytial virus (RSV) hospitalization rates.\n - Additional information, including the surveillance catchment area, is available on the [RESP-NET website](/resp-net/dashboard/index.html).\n - Hospitalization rates are calculated using the National Center for Health Statistics (NCHS) vintage bridged-race postcensal population estimates (for March–September 2020) or the U.S. Census vintage unbridged-race postcensal population estimates (for October 2020–present) for the counties or county equivalents included in the surveillance area.\n - RESP-NET surveillance for COVID-19 and RSV have been conducted year-round since 2020.\n - FluSurv-NET surveillance was traditionally conducted from October 1 through April 30 of the following year; however, starting with the 2025-26 season it will be conducted year-round.\n - Rates are likely to underestimate the impact of COVID-19, flu, and RSV on hospitalizations because of undertesting, differing provider or facility testing practices, and diagnostic test sensitivity. Rates presented do not adjust for testing practices which may differ by pathogen, age, race and ethnicity, and other demographic criteria.\n - The data points for the 3 most recent weeks of data represent estimates of the RESP-NET hospitalization rates, called \"[nowcasts](https://www.cdc.gov/cfa-behind-the-model/php/data-research/nowcasting.html),\" which are model-based estimates that account for delayed reporting of recent hospitalizations to estimate the RESP-NET rates from the partial data received so far. Observed data values, estimated ranges, and additional details about the model estimation are available on the [RESP-NET website](/resp-net/dashboard/index.html).\n - Because population estimates for ages 0–1 year are not available in smaller groupings, we split that number in two to estimate the populations for children younger than 6 months and for children 6 to less than 12 months.\n - Black, White, American Indian/Alaska Native, and Asian/Pacific Islander people were categorized as non-Hispanic; Hispanic people could be of any race. If Hispanic ethnicity was unknown, non-Hispanic ethnicity was assumed. Rates presented by race and ethnicity are calculated using records with known races. Those with missing or unknown race are excluded from race-specific estimates but are included in overall estimates.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Viral respiratory deaths\n\n\n\n\n\n\n - **SOURCE:** Provisional Deaths from the CDC's National Center for Health Statistics (NCHS) National Vital Statistics System (NVSS). Accessed from [CDC Wonder](https://wonder.cdc.gov/mcd-icd10-provisional.html).\n - Provisional data are non-final counts of deaths based on mortality data in NVSS. Data during recent periods are incomplete because of the gap in time between when a death occurs and when a death certificate is completed, submitted to NCHS, and processed for reporting. This delay can range from 1 week to 8 weeks or more, depending on the jurisdiction.\n - Definitions: When a person dies, the underlying and contributing causes are recorded in the form of ICD-10 codes. Cause-specific death counts are defined as those deaths with the designated ICD-10. In this case, the ICD-10 code definitions are as follows: COVID-19 (U07.1), flu (J09-J11), RSV (J12.1, J20.5, J21.0).\n - The death certificate data presented here provide a timely understanding of trends in deaths associated with each condition. However, it has been long recognized that only counting deaths where flu was recorded on death certificates would [underestimate flu's overall impact on mortality](/flu-burden/php/about/how-cdc-estimates.html). Flu can lead to death from other causes, such as pneumonia and congestive heart failure; however, it may not be listed on the death certificate as a contributing cause for multiple reasons, including a lack of testing. Therefore, CDC has an established history of using models to [estimate influenza-associated death totals](/flu-burden/php/data-vis/). In the fall of 2024, CDC released [COVID-19](/covid/php/surveillance/burden-estimates.html) and [RSV](https://www.cdc.gov/rsv/php/surveillance/burden-estimates.html) estimated death totals.\n - Death data are displayed by date of death. Death data reported are based on the total number of deaths received and coded in a certain time period and may not represent all deaths that occurred in that period. Death counts are updated as additional data are received.\n - Percent of deaths is not presented for weeks where death counts are between 1-9 in accordance with NCHS data confidentiality standards.\n - Provisional death data represent deaths among U.S. residents and occurring in the 50 states, plus the District of Columbia. Assignment to a geographic area is based on the place of residence listed on the death certificate.\n - The percentage of all reported deaths that are attributed as COVID-19, flu, and RSV is calculated as the number of COVID-19, flu, and RSV deaths divided by the number of deaths from all causes multiplied by 100. The percentage of deaths is less affected by incomplete reporting in recent weeks because death certificate data from natural causes of death and all causes have similar timeliness.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Explore source data\n\n\n - [RESP-NET Respiratory Virus Hospitalizations Dashboard](/resp-net/dashboard/index.html)\n - [NHSN Hospital Respiratory Data Dashboard](/nhsn/psc/hospital-respiratory-dashboard.html)\n - [Influenza Hospitalizations Dashboards](https://gis.cdc.gov/GRASP/Fluview/FluHospRates.html)\n - [RSV Hospitalizations Dashboard](/rsv/php/surveillance/rsv-net.html)\n - [Estimates of COVID-19 Burden](/covid/php/surveillance/burden-estimates.html)\n - [COVID-19 Death Data](/nchs/nvss/vsrr/COVID19/index.htm)\n\n\n\n\n\n\n\n\n\n\n\n## On This Page\n\n\n\n\n - [Summary](#cdc_data_surveillance_section_1-summary)\n - [Hospitalization numbers](#cdc_data_surveillance_section_2-hospitalization-numbers)\n - [Viral respiratory deaths in the United States](#cdc_data_surveillance_section_3-viral-respiratory-deaths-in-the-united-states)\n - [Data notes](#cdc_data_surveillance_section_4-data-notes)\n - [Explore source data](#cdc_data_surveillance_section_5-explore-source-data)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n Sept. 11, 2026\n\n\n\n\n\n [Sources and Page Info](#content-sources) [Print](#print) [Share](#share)\n\n # # # #\n\n\n\n\n\n\n\n [Facebook](https://www.facebook.com/) [LinkedIn](https://www.linkedin.com/) [Twitter](https://twitter.com/) [Syndicate](https://tools.cdc.gov/medialibrary/index.aspx#[REDACTED])\n\n\n\n\n\n\n\n\n\nContent Source\n\n [National Center for Immunization and Respiratory Diseases (NCIRD)](/ncird/index.html)\n\n\n\n About This Page\n\n\n\n Published: April 24, 2026\n\n\n\n Updated: September 11, 2026\n\nThis page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.\n\n\n\n\n\n Reviewed: September 11, 2026\n\nThe information on this page was last reviewed by subject matter experts to ensure accuracy.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## [** Respiratory Illnesses **](/respiratory-viruses/index.html)\n\n\n\nRespiratory illnesses affect the lungs and airways. Get information on common causes, prevention actions, and current levels of illness in your community.\n\n [View All](/respiratory-viruses/site.html)\n\n\n\n\n\n\n\n\n\n### [For Everyone](/respiratory-viruses/index.html#gen)\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n\n\n\n\n\n\n\n\n\n### [Health Care Providers](/respiratory-viruses/hcp/index.html#hcp)\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n\n\n\n\n\n\n\n### [Public Health](/respiratory-viruses/site.html#php)\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n\n\n\n\n\n\n\n\n\n\n\n ** [Sign up for Email Updates](https://tools.cdc.gov/campaignproxyservice/subscriptions.aspx#[REDACTED]) **\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Contact Us](#contactUs)\n\n\n\n [Contact Us](https://www.cdc.gov/cdc-info/index.html)\n - [Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n\n\n [About CDC](#aboutCDC)\n\n\n\n [About CDC](https://www.cdc.gov/about/)\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n\n\n\n\n\n [Policies](#policies)\n\n\n\n\n\n\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n\n\n\n\n - [FOIA](https://www.cdc.gov/foia/)\n - [OIG](https://oig.hhs.gov/)\n - [No Fear Act](https://www.cdc.gov/oeeowe/no-fear-act/)\n - [Nondiscrimination](https://www.cdc.gov/other/nondiscrimination.html)\n - [Vulnerability Disclosure Policy](https://www.hhs.gov/vulnerability-disclosure-policy/index.html)\n\n\n\n\n\n\n\n\n\n [Languages](#languages)\n\n\n\n\n\n\n\n [Languages](https://www.cdc.gov/other/other-languages/index.html)\n - [Español](https://www.cdc.gov/spanish/)\n\n\n\n\n\n [Language Assistance](https://www.cdc.gov/other/language-assistance.html)\n\n\n\n\n - [Español](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [繁體中文](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tiếng Việt](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [한국어](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n - [Tagalog](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Русский](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [العربية](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Kreyòl Ayisyen](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n - [Français](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Polski](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Português](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Italiano](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n - [Deutsch](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [日本語](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [فارسی](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [English](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Archive](#archive)\n\n\n\n\n - [CDC Archive](https://archive.cdc.gov/)\n - [Public Health Publications](https://stacks.cdc.gov/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Contact Us](#mobile-footer-contactUs)\n\n [Contact Us](https://www.cdc.gov/cdc-info/index.html)\n - [Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n [About CDC](#mobile-footer-aboutCDC)\n\n\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n - [About CDC](https://www.cdc.gov/about/)\n\n\n\n [Policies](#mobile-footer-policies)\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n - [FOIA](https://www.cdc.gov/foia/)\n - [OIG](https://oig.hhs.gov/)\n - [No Fear Act](https://www.cdc.gov/oeeowe/no-fear-act/)\n - [Nondiscrimination](https://www.cdc.gov/other/nondiscrimination.html)\n - [Vulnerability Disclosure Policy](https://www.hhs.gov/vulnerability-disclosure-policy/index.html)\n\n\n\n [Languages](#mobile-footer-languages)\n\n\n\nLanguages\n\n\n - [Español](https://www.cdc.gov/spanish/)\n\n\n\nLanguage Assistance\n\n\n - [Español](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [繁體中文](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tiếng Việt](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [한국어](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tagalog](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Русский](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [العربية](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Kreyòl Ayisyen](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Français](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Polski](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Português](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Italiano](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Deutsch](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [日本語](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [فارسی](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [English](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n [Archive](#mobile-footer-archive)\n\n\n - [CDC Archive](https://archive.cdc.gov/)\n - [Public Health Publications](https://stacks.cdc.gov/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov/)\n\n\n\n\n\n [**](https://www.facebook.com/CDC) [**](https://twitter.com/CDCgov) [**](https://www.instagram.com/CDCgov) [**](https://www.linkedin.com/company/centers-for-disease-control-and-prevention)\n\n\n\n [**](https://www.youtube.com/cdc) [**](https://www.pinterest.com/cdcgov) [**](https://www.snapchat.com/add/cdcgov) [**](https://www.cdc.gov/rss)\n\n\n\n\n\n\n\n\n\n\n\n [HHS.gov](https://hhs.gov) [USA.gov](https://usa.gov)\n\n\n\n\n\n\n\n\n\n\n\n **",
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Sub-agent trace (toolu_01Eji9rXx25Qx7nXR7riwUDt, 3 events)
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"content": "[{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 9\",\"percent_pos\":\"9.36\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 8\",\"percent_pos\":\"2.98\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 7\",\"percent_pos\":\"2.95\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 6\",\"percent_pos\":\"14.48\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 5\",\"percent_pos\":\"2.87\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 4\",\"percent_pos\":\"4.59\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 3\",\"percent_pos\":\"3.26\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 2\",\"percent_pos\":\"3.18\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 10\",\"percent_pos\":\"6.31\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"Region 1\",\"percent_pos\":\"2.81\"}\n,{\"mmwrweek_end\":\"2026-09-05T00:00:00.000\",\"level\":\"National\",\"percent_pos\":\"5.55\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 9\",\"percent_pos\":\"9.66\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 8\",\"percent_pos\":\"3.22\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 7\",\"percent_pos\":\"2.74\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 6\",\"percent_pos\":\"9.81\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 5\",\"percent_pos\":\"2.72\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 4\",\"percent_pos\":\"6.12\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 3\",\"percent_pos\":\"3.3\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 2\",\"percent_pos\":\"3.18\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 10\",\"percent_pos\":\"6.92\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 1\",\"percent_pos\":\"3.03\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"National\",\"percent_pos\":\"5.59\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"National\",\"percent_pos\":\"6.15\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 1\",\"percent_pos\":\"3.18\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 10\",\"percent_pos\":\"7.02\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 2\",\"percent_pos\":\"3.06\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 3\",\"percent_pos\":\"3.34\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 4\",\"percent_pos\":\"6.75\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 5\",\"percent_pos\":\"2.71\"}\n,{\"mmwrweek_end\":\"2026-08-29T00:00:00.000\",\"level\":\"Region 6\",\"percent_pos\":\"9.88\"}]\n",
"content_length": 2524,
"content_type": "application/json",
"description": "",
"status_code": 200,
"success": true,
"title": "",
"url": "https://data.cdc.gov/resource/gvsb-yw6g.json"
},
"error": "",
"elapsed": 0.348751727
}
web_fetch completeddispatch toolu_01M2qXE3oMt7BzA8YpY13Qaw
Input
{
"brief": "RSV percent positivity latest weeks",
"max_age_seconds": 3600,
"url": "https://data.cdc.gov/resource/3cxc-4k8q.json?%24order=%5BREDACTED%5D&%24limit=%5BREDACTED%5D"
}
Tool Progress E0015
(no result)
Tool Result E0016
{
"content": "[{\"level\":\"National\",\"perc_diff\":\"0\",\"pcr_percent_positive\":\"0.5\",\"percent_pos_2_week\":\"0.2\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"156\",\"detections_2_week\":\"269\",\"detections_4_week\":\"496\",\"posted\":\"2026-09-09T20:58:06.000\",\"mmwrweek_end\":\"2026-09-05T00:00:00.000\"}\n,{\"level\":\"Region 9\",\"perc_diff\":\"0\",\"pcr_percent_positive\":\"0.7\",\"percent_pos_2_week\":\"0.3\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"23.7\",\"detections_2_week\":\"41.6\",\"detections_4_week\":\"79.8\",\"pcr_tests\":\"3166.5\",\"posted\":\"2026-09-09T20:59:29.000\",\"mmwrweek_end\":\"2026-09-05T00:00:00.000\"}\n,{\"level\":\"Region 8\",\"perc_diff\":\"-0.1\",\"pcr_percent_positive\":\"0.2\",\"percent_pos_2_week\":\"0.1\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"3.7\",\"detections_2_week\":\"5.6\",\"detections_4_week\":\"10.2\",\"pcr_tests\":\"1307\",\"posted\":\"2026-09-09T20:59:29.000\",\"mmwrweek_end\":\"2026-09-05T00:00:00.000\"}\n,{\"level\":\"Region 7\",\"perc_diff\":\"0\",\"pcr_percent_positive\":\"0.4\",\"percent_pos_2_week\":\"0.2\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"15.7\",\"detections_2_week\":\"27.4\",\"detections_4_week\":\"51.2\",\"pcr_tests\":\"3769.5\",\"posted\":\"2026-09-09T20:59:29.000\",\"mmwrweek_end\":\"2026-09-05T00:00:00.000\"}\n,{\"level\":\"Region 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"content_length": 8786,
"content_type": "application/json",
"description": "",
"status_code": 200,
"success": true,
"title": "",
"url": "https://data.cdc.gov/resource/3cxc-4k8q.json"
}
Sub-agent trace (toolu_01M2qXE3oMt7BzA8YpY13Qaw, 3 events)
tools_started web_fetch t=118007.463
Inner payload
{
"tool_name": "web_fetch",
"tool_input": {
"brief": "RSV percent positivity latest weeks",
"max_age_seconds": 3600,
"url": "https://data.cdc.gov/resource/3cxc-4k8q.json?%24order=%5BREDACTED%5D&%24limit=%5BREDACTED%5D"
},
"dispatch_id": "toolu_01M2qXE3oMt7BzA8YpY13Qaw",
"parent_dispatch_id": "",
"handle": "",
"panel_kind": "web_fetch"
}tools_progress web_fetch t=118007.464
Inner payload
{
"tool_name": "web_fetch",
"dispatch_id": "toolu_01M2qXE3oMt7BzA8YpY13Qaw",
"status": "running",
"result": null,
"error": "",
"elapsed": null,
"fields": {
"progress": {
"message": "RSV percent positivity latest weeks",
"metadata": {
"browser_chain": false,
"url": "https://data.cdc.gov/resource/3cxc-4k8q.json?%24order=%5BREDACTED%5D&%24limit=%5BREDACTED%5D"
}
},
"status": "running",
"updatedAt": 1789169389598
}
}tools_completed web_fetch t=118007.465
Inner payload
{
"tool_name": "web_fetch",
"dispatch_id": "toolu_01M2qXE3oMt7BzA8YpY13Qaw",
"status": "completed",
"result": {
"content": "[{\"level\":\"National\",\"perc_diff\":\"0\",\"pcr_percent_positive\":\"0.5\",\"percent_pos_2_week\":\"0.2\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"156\",\"detections_2_week\":\"269\",\"detections_4_week\":\"496\",\"posted\":\"2026-09-09T20:58:06.000\",\"mmwrweek_end\":\"2026-09-05T00:00:00.000\"}\n,{\"level\":\"Region 9\",\"perc_diff\":\"0\",\"pcr_percent_positive\":\"0.7\",\"percent_pos_2_week\":\"0.3\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"23.7\",\"detections_2_week\":\"41.6\",\"detections_4_week\":\"79.8\",\"pcr_tests\":\"3166.5\",\"posted\":\"2026-09-09T20:59:29.000\",\"mmwrweek_end\":\"2026-09-05T00:00:00.000\"}\n,{\"level\":\"Region 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5\",\"perc_diff\":\"0\",\"pcr_percent_positive\":\"0.2\",\"percent_pos_2_week\":\"0.1\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"13.7\",\"detections_2_week\":\"28.3\",\"detections_4_week\":\"61.7\",\"pcr_tests\":\"5795.5\",\"posted\":\"2026-09-02T19:33:56.000\",\"mmwrweek_end\":\"2026-08-29T00:00:00.000\"}\n,{\"level\":\"Region 6\",\"perc_diff\":\"0\",\"pcr_percent_positive\":\"0.5\",\"percent_pos_2_week\":\"0.3\",\"percent_pos_4_week\":\"0.2\",\"pcr_detections\":\"24.3\",\"detections_2_week\":\"48.5\",\"detections_4_week\":\"104.9\",\"pcr_tests\":\"5124\",\"posted\":\"2026-09-02T19:33:56.000\",\"mmwrweek_end\":\"2026-08-29T00:00:00.000\"}\n,{\"level\":\"Region 7\",\"perc_diff\":\"0.1\",\"pcr_percent_positive\":\"0.5\",\"percent_pos_2_week\":\"0.2\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"10.7\",\"detections_2_week\":\"21.6\",\"detections_4_week\":\"44.6\",\"pcr_tests\":\"2362.5\",\"posted\":\"2026-09-02T19:33:56.000\",\"mmwrweek_end\":\"2026-08-29T00:00:00.000\"}\n,{\"level\":\"Region 8\",\"perc_diff\":\"0.1\",\"pcr_percent_positive\":\"0.3\",\"percent_pos_2_week\":\"0.1\",\"percent_pos_4_week\":\"0\",\"pcr_detections\":\"3\",\"detections_2_week\":\"4.7\",\"detections_4_week\":\"8.7\",\"pcr_tests\":\"1239.5\",\"posted\":\"2026-09-02T19:33:56.000\",\"mmwrweek_end\":\"2026-08-29T00:00:00.000\"}\n,{\"level\":\"Region 9\",\"perc_diff\":\"0.1\",\"pcr_percent_positive\":\"0.8\",\"percent_pos_2_week\":\"0.3\",\"percent_pos_4_week\":\"0.2\",\"pcr_detections\":\"20.3\",\"detections_2_week\":\"40.9\",\"detections_4_week\":\"76.7\",\"pcr_tests\":\"3199.5\",\"posted\":\"2026-09-02T19:33:56.000\",\"mmwrweek_end\":\"2026-08-29T00:00:00.000\"}\n,{\"level\":\"National\",\"perc_diff\":\"0\",\"pcr_percent_positive\":\"0.4\",\"percent_pos_2_week\":\"0.2\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"98\",\"detections_2_week\":\"253\",\"detections_4_week\":\"487\",\"posted\":\"2026-09-02T19:33:47.000\",\"mmwrweek_end\":\"2026-08-29T00:00:00.000\"}\n,{\"level\":\"Region 1\",\"perc_diff\":\"-0.2\",\"pcr_percent_positive\":\"0.3\",\"percent_pos_2_week\":\"0.2\",\"percent_pos_4_week\":\"0.2\",\"pcr_detections\":\"5.8\",\"detections_2_week\":\"15.4\",\"detections_4_week\":\"33.2\",\"pcr_tests\":\"1620.7\",\"posted\":\"2026-09-09T20:59:29.000\",\"mmwrweek_end\":\"2026-08-29T00:00:00.000\"}\n,{\"level\":\"Region 10\",\"perc_diff\":\"0.1\",\"pcr_percent_positive\":\"0.4\",\"percent_pos_2_week\":\"0.1\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"7.3\",\"detections_2_week\":\"10.8\",\"detections_4_week\":\"22.4\",\"pcr_tests\":\"1930.3\",\"posted\":\"2026-09-09T20:59:29.000\",\"mmwrweek_end\":\"2026-08-29T00:00:00.000\"}\n,{\"level\":\"Region 2\",\"perc_diff\":\"0.1\",\"pcr_percent_positive\":\"0.4\",\"percent_pos_2_week\":\"0.2\",\"percent_pos_4_week\":\"0.1\",\"pcr_detections\":\"8.5\",\"detections_2_week\":\"14.2\",\"detections_4_week\":\"25.6\",\"pcr_tests\":\"2046.3\",\"posted\":\"2026-09-09T20:59:29.000\",\"mmwrweek_end\":\"2026-08-29T00:00:00.000\"}]\n",
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CDC's respiratory data updated Sept 11. COVID is elevated and rising nationally, flu and RSV are low, but the South is spiking.
COVID-19 test positivity · CDC weekly lab data
| Area | Sep 5 | Aug 29 |
|---|
| National | 5.55% | 5.59% |
| Region 6 (TX, LA, OK, AR, NM) | 14.48% | 9.81% |
| Region 9 (CA, AZ, NV, HI) | 9.36% | 9.66% |
| Region 10 (Pacific NW) | 6.31% | 6.92% |
| Region 4 (Southeast) | 4.59% | 6.12% |
| Region 3 (mid-Atlantic) | 3.26% | 3.30% |
| Region 8 (Mountain) | 2.98% | 3.22% |
| Region 5 (Midwest) | 2.87% | 2.72% |
| Region 1 (New England) | 2.81% | 3.03% |
Markdown source
### COVID-19 test positivity · CDC weekly lab data
| Area | Sep 5 | Aug 29 |
|---|---|---|
| National | 5.55% | 5.59% |
| Region 6 (TX, LA, OK, AR, NM) | 14.48% | 9.81% |
| Region 9 (CA, AZ, NV, HI) | 9.36% | 9.66% |
| Region 10 (Pacific NW) | 6.31% | 6.92% |
| Region 4 (Southeast) | 4.59% | 6.12% |
| Region 3 (mid-Atlantic) | 3.26% | 3.30% |
| Region 8 (Mountain) | 2.98% | 3.22% |
| Region 5 (Midwest) | 2.87% | 2.72% |
| Region 1 (New England) | 2.81% | 3.03% |
Region 6 jumped 4.7 points in one week. The West stays high but flat. RSV is 0.5% nationally, highest in Region 4 at 0.9%. Flu is still minimal.
https://www.cdc.gov/respiratory-viruses/data/
https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-Respiratory-Syncytial-Virus-/3cxc-4k8q/about_data
Normalized evidence
The redacted, numbered record a structured judge grades. Check rows above link to the IDs they cite.
Use the web_fetch tool to answer the prompt.
What do the latest weekly data on https://www.cdc.gov/respiratory-viruses/data/ show for COVID-19, influenza, and RSV? Compare the newest week with the prior week and identify regional hot spots.
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{"dispatch_id": "toolu_01AveUZrSpFJ1AtT3mJLoJSU", "elapsed": 0.080427948, "error": "", "result": {"content": "Respiratory Illnesses Data Channel | Respiratory Illnesses | CDC\n\n [Skip directly to site content](#content) [Skip directly to search](#cdc-search__input)\n\n\n\n\n\n\n\n\n\n\n\n\n\n  An official website of the United States government\n\n [Here's how you know](#gov-notice)\n\n\n\n\n\n\n\n \n\n **Official websites use .gov**\n\nA **.gov** website belongs to an official government organization in the United States.\n\n\n\n\n\n\n\n \n\n **Secure .gov websites use HTTPS**\n\nA **lock** ( ** ) or **https://** means you've safely connected to the .gov website. 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However, it remains possible that there could be larger increases this summer, particularly if a variant that the immune system no longer recognizes becomes more common . Scenario modeling indicates that regions which did not experience a substantial level of COVID-19 activity during the most recent winter months (South and West) are expected to experience increases in COVID-19 activity in the summer months. Read more: [2026 COVID-19 Summer Outlook | CFA: Qualitative Assessments | CDC](/cfa-qualitative-assessments/php/data-research/2026covid-19outlook.html)\n\n\n\n\n\n\n\n## Protect yourself and your community\n\n\n\n\n\n### Looking for guidance?\n\n\n\nThere are simple measures you can take to protect yourself and those around you.\n\n[Updated CDC Guidance](https://www.cdc.gov/respiratory-viruses/prevention/index.html)\n\n\n\n\n - [Explore resources and recommendations for older adults - Stay informed and protected](/respiratory-viruses/risk-factors/index.html#cdc_risk_factors_who-older-adults)\n - [Review tailored health recommendations for high-risk individuals](/respiratory-viruses/risk-factors/index.html#cdc_risk_factors_risk_factor-people-with-underlying-health-conditions)\n - [Feeling ill? Take immediate steps to protect yourself and others – Start here](/respiratory-viruses/prevention/precautions-when-sick.html)\n - [Have symptoms? Consider wearing a mask](/respiratory-viruses/prevention/masks.html)\n - [Take action against germs – Practice good hygiene](/respiratory-viruses/prevention/hygiene.html)\n\n\n\n\n\n\n\n## Continue exploring these data\n\n\n\n[](/respiratory-viruses/data/activity-levels.html)\n\n\n\n[Respiratory Virus Activity Levels](/respiratory-viruses/data/activity-levels.html)\n\n\n\nUpdates on how COVID-19, Flu, and RSV may be spreading nationally and in your state\n\n Sept 11, 2026\n\n\n\n\n\n[](/respiratory-viruses/data/illness-severity.html)\n\n\n\n[Severe Viral Respiratory Illness](/respiratory-viruses/data/illness-severity.html)\n\n\n\nData on how respiratory viruses are contributing to serious health outcomes\n\n Sept 11, 2026\n\n\n\n\n\n[](/respiratory-viruses/data/most-impacted.html)\n\n\n\n[People Most Impacted by Respiratory Viruses](/respiratory-viruses/data/most-impacted.html)\n\n\n\nHow people of different ages, race and ethnicity, and sex are affected by COVID-19, flu, and RSV.\n\n Sept 11, 2026\n\n\n\n\n\n[](/respiratory-viruses/data/illnesses-going-around.html)\n\n\n\n[Other Respiratory Illnesses Going Around](/respiratory-viruses/data/illnesses-going-around.html)\n\n\n\nThis page details respiratory illnesses from viruses and bacteria other than COVID-19, flu, and RSV\n\n Sept 11, 2026\n\n\n\n\n\n[](/respiratory-viruses/data/vaccination-trends.html)\n\n\n\n[Vaccination Trends](/respiratory-viruses/data/vaccination-trends.html)\n\n\n\nVaccination uptake & intent for COVID, flu, and RSV\n\n Sept 11, 2026\n\n\n\n\n\n\n\n\n\n## Explore related data\n\n\n\n\n\n\n\n\n\n### Modeling Data\n\n\n\n\n\n\n\n[Anticipated trends for COVID-19 infections](/cfa-modeling-and-forecasting/rt-estimates/index.html), based on modeling, are displayed at the national and state levels.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Wastewater\n\n\n\n\n\n\n\n[Wastewater (sewage) data specific to SARS-CoV-2](/nwss/rv/COVID19-national-data.html), the virus that causes COVID-19, are displayed at the national, regional, and state levels. These data can provide an early signal of changes in infection levels.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### COVID-19 Variants\n\n\n\n\n\n\n\n[COVID-19 variants and genomic surveillance](/covid/php/variants/variants-and-genomic-surveillance.html) data are displayed for the nation.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Nursing Homes\n\n\n\n\n\n\n\n[Nursing home data on vaccinations, cases, and hospitalizations for COVID-19, flu, and RSV](/nhsn/ltc/ltc-report-overview.html) are displayed at the national and state levels.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Hospital Bed Occupancy\n\n\n\n\n\n\n\n[Weekly trends in overall hospital bed occupancy and reporting status](/nhsn/psc/hospital-respiratory-dashboard.html).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## On This Page\n\n\n\n\n - [Your community snapshot](#cdc_data_surveillance_section_1-your-community-snapshot)\n - [Weekly national summary](#cdc_data_surveillance_section_2-weekly-national-summary)\n - [Season Outlook](#cdc_data_surveillance_section_7-season-outlook)\n - [Protect yourself and your community](#cdc_data_surveillance_section_3-protect-yourself-and-your-community)\n - [Continue exploring these data](#cdc_data_surveillance_section_4-continue-exploring-these-data)\n - [Explore related data](#cdc_data_surveillance_section_5-explore-related-data)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n Sept. 11, 2026\n\n\n\n\n\n [Sources and Page Info](#content-sources) [Print](#print) [Share](#share)\n\n # # # #\n\n\n\n\n\n\n\n [Facebook](https://www.facebook.com/) [LinkedIn](https://www.linkedin.com/) [Twitter](https://twitter.com/) [Syndicate](https://tools.cdc.gov/medialibrary/index.aspx#[REDACTED])\n\n\n\n\n\n\n\n\n\nContent Source\n\n [National Center for Immunization and Respiratory Diseases (NCIRD)](/ncird/index.html)\n\n\n\n About This Page\n\n\n\n Published: July 17, 2024\n\n\n\n Updated: September 11, 2026\n\nThis page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.\n\n\n\n\n\n Reviewed: September 11, 2026\n\nThe information on this page was last reviewed by subject matter experts to ensure accuracy.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## [** Respiratory Illnesses **](/respiratory-viruses/index.html)\n\n\n\nRespiratory illnesses affect the lungs and airways. Get information on common causes, prevention actions, and current levels of illness in your community.\n\n [View All](/respiratory-viruses/site.html)\n\n\n\n\n\n\n\n\n\n### [For Everyone](/respiratory-viruses/index.html#gen)\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n\n\n\n\n\n\n\n\n\n### [Health Care Providers](/respiratory-viruses/hcp/index.html#hcp)\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n\n\n\n\n\n\n\n### [Public Health](/respiratory-viruses/site.html#php)\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n\n\n\n\n\n\n\n\n\n\n\n ** [Sign up for Email Updates](https://tools.cdc.gov/campaignproxyservice/subscriptions.aspx#[REDACTED]) **\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Contact Us](#contactUs)\n\n\n\n [Contact Us](https://www.cdc.gov/cdc-info/index.html)\n - [Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n\n\n [About CDC](#aboutCDC)\n\n\n\n [About CDC](https://www.cdc.gov/about/)\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n\n\n\n\n\n [Policies](#policies)\n\n\n\n\n\n\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n\n\n\n\n - 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[Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n [About CDC](#mobile-footer-aboutCDC)\n\n\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n - [About CDC](https://www.cdc.gov/about/)\n\n\n\n [Policies](#mobile-footer-policies)\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n - [FOIA](https://www.cdc.gov/foia/)\n - [OIG](https://oig.hhs.gov/)\n - [No Fear Act](https://www.cdc.gov/oeeowe/no-fear-act/)\n - [Nondiscrimination](https://www.cdc.gov/other/nondiscrimination.html)\n - [Vulnerability Disclosure Policy](https://www.hhs.gov/vulnerability-disclosure-policy/index.html)\n\n\n\n [Languages](#mobile-footer-languages)\n\n\n\nLanguages\n\n\n - [Español](https://www.cdc.gov/spanish/)\n\n\n\nLanguage Assistance\n\n\n - [Español](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [繁體中文](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tiếng Việt](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [한국어](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tagalog](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Русский](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [العربية](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Kreyòl Ayisyen](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Français](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Polski](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Português](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Italiano](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Deutsch](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [日本語](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [فارسی](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [English](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n\n\n\n [Archive](#mobile-footer-archive)\n\n\n - [CDC Archive](https://archive.cdc.gov/)\n - [Public Health Publications](https://stacks.cdc.gov/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov/)\n\n\n\n\n\n [**](https://www.facebook.com/CDC) [**](https://twitter.com/CDCgov) [**](https://www.instagram.com/CDCgov) [**](https://www.linkedin.com/company/centers-for-disease-control-and-prevention)\n\n\n\n [**](https://www.youtube.com/cdc) [**](https://www.pinterest.com/cdcgov) [**](https://www.snapchat.com/add/cdcgov) [**](https://www.cdc.gov/rss)\n\n\n\n\n\n\n\n\n\n\n\n [HHS.gov](https://hhs.gov) [USA.gov](https://usa.gov)\n\n\n\n\n\n\n\n\n\n\n\n **", "content_length": 18131, "content_type": "text/html", "description": "View data for COVID-19, flu, and RSV activity in your community and across the United States.", "status_code": 200, "success": true, "title": "Respiratory Illnesses Data Channel | Respiratory Illnesses | CDC", "url": "https://www.cdc.gov/respiratory-viruses/data/"}, "status": "completed", "tool_name": "web_fetch"}
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{"dispatch_id": "toolu_011o3GgVMMr3KatAw4V5RzQa", "elapsed": 0.028249426, "error": "", "result": {"content": "Respiratory Virus Activity Levels | Respiratory Illnesses | CDC\n\n [Skip directly to site content](#content) [Skip directly to search](#cdc-search__input)\n\n\n\n\n\n\n\n\n\n\n\n\n\n  An official website of the United States government\n\n [Here's how you know](#gov-notice)\n\n\n\n\n\n\n\n \n\n **Official websites use .gov**\n\nA **.gov** website belongs to an official government organization in the United States.\n\n\n\n\n\n\n\n \n\n **Secure .gov websites use HTTPS**\n\nA **lock** ( ** ) or **https://** means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n Explore This Topic\n\n Search\n\n Search Clear Search\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [For Everyone](/respiratory-viruses/index.html)\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View all](/respiratory-viruses/site.html#gen)\n\n\n\n\n\n\n\n\n\n [Health Care Providers](/respiratory-viruses/hcp/index.html)\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View all](/respiratory-viruses/site.html#hcp)\n\n\n\n\n\n\n\n\n\n [Public Health](/respiratory-viruses/site.html#php)\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View all](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n ** Related Topics: **\n\n\n\n [COVID-19](/covid/index.html) | [Seasonal Flu](/flu/index.html) | [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n *search*\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html) Menu **\n\n\n\n\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View All](/respiratory-viruses/site.html#gen) [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Health Care Providers\n\n\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View All](/respiratory-viruses/site.html#hcp) [Home](/respiratory-viruses/hcp/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Public Health\n\n\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View All](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n Related Topics\n\n\n\n\n\n\n - [COVID-19](/covid/index.html)\n - [Seasonal Flu](/flu/index.html)\n - [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n \n\n\n\n\n\n\n\n\n\n\n\n [About](/respiratory-viruses/about/index.html) [Risk Factors](/respiratory-viruses/risk-factors/index.html) [Prevention](/respiratory-viruses/prevention/index.html) [Treatment](/respiratory-viruses/treatment/index.html) [Caring for Yourself](/respiratory-viruses/immune-health/index.html) [Data and Trends](/respiratory-viruses/data/index.html) [Communication Resources](/respiratory-viruses/communication-resources/index.html) View Menu\n\n\n\n\n\n\n\n\n\n\n\n# Respiratory Virus Activity Levels\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n Sept. 11, 2026\n\n\n\n [Español](/respiratory-viruses/es/data/niveles-de-actividad.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## What to know\n\n\n\n\n\n\n - CDC tracks respiratory virus activity across the country in several different ways.\n\n - Tracking trends with respiratory viruses using multiple methods helps us spot patterns in a more thorough way.\n\n - Use these pages to get an overall look at respiratory virus illness across the country and in your area.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Summary\n\n\n\n\n\n\n\n\n\n## Level of respiratory virus activity\n\n\n\nCDC tracks respiratory virus activity using a measure called the acute respiratory illness (ARI) metric. ARI is tracked by activity levels, so people can easily compare states and understand how much illness is occurring in their area. ARI includes many types of respiratory illnesses that can lead people to go to the emergency department (ED), including serious infections like [COVID-19](https://www.cdc.gov/covid/index.html),[flu](https://www.cdc.gov/flu/index.html), and [RSV](https://www.cdc.gov/rsv/index.html) disease. Because COVID-19, flu, and RSV are among the most common and serious causes of respiratory illness, they serve as key indicators of overall respiratory virus activity.\n\n\n\n **Tip:** Move your mouse over different areas of the map to see more information about illness levels across the country.\n\n\n\nSelect either **map or trend** below to change views and see more details.\n\n\n\nRefer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more details about the data source.\n\n\n\n\n\n\n\n\n\n## Percent positive tests for respiratory viruses\n\n\n\nTracking the percent of laboratory tests that are positive for SARS-CoV-2 (the virus that causes COVID-19), influenza viruses (flu), and RSV is another method used to check respiratory virus activity. These data can provide useful warnings alongside emergency department (ED) and hospital data. An increase in the **percent of positive** tests means more viruses are spreading in the community.\n\n\n\n**Tip:** move your mouse over the chart for more detailed information. Each virus is represented by a different color, see the key at the top of the graphic. Preliminary data are shaded in gray. For more information on data sources, refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All).\n\n\n\n\n\n\n\n\n\n\n\n## Community viral activity level\n\n\n\nWastewater (sewage) can be tested in the laboratory to detect traces of viruses circulating in a community. It can pick up signs of infection even from people who feel perfectly healthy. Viruses can be found in wastewater that comes from homes and businesses. Because wastewater contains contributions from many places, we cannot identify the exact source of viruses—such as people, livestock, or other animals.\n\n\n\n**Keep Reading** [COVID-19 National Wastewater Data](/nwss/rv/COVID19-national-data.html)\n\n**You** **can select** either COVID-19, Influenza A, or RSV disease to see information about each illness.\n\n\n\n**Tip:** click any area on the map to reveal detailed information about that location. Refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more details about data sources and important information to help you understand how wastewater is used as an early sign of illness.\n\n\n\n* Level based on a small segment (less than 5%) of the population and may not be representative of the state/territory. [Read more »](/respiratory-viruses/data/faqs.html)\n\n\n\n\n\n\n\n## ED visits for viral respiratory illness\n\n\n\n CDC tracks emergency department (ED) visits to quickly understand how a virus is spreading and how sick people are getting. ED data provide timely warnings about whether COVID-19, flu, or RSV disease is increasing or decreasing. CDC tracks the weekly percent of all ED visits associated with COVID-19, flu, and RSV.\n\n\n\nThe weekly percent of total ED visits associated with COVID-19, flu, and RSV are each shown in line charts.\n\n\n\n**Tip:** move your mouse over the chart and you will see information about ED visits for each illness over a certain time. Refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more details.\n\n\n\n\n\n\n\n\n\n## Epidemic trends\n\n\n\nCDC uses data from emergency department visits from previous weeks to model how viruses spread from week to week. This trend is based on a measurement called Rt, the time-based reproduction number, which measures the expected number of people infected by one patient over time.\n\n\n\n*Flu and RSV epidemic trend data updates for the 2025-2026 respiratory illness season ended on May 29, 2026. COVID-19 epidemic trend data will continue to update throughout the summer. We will begin flu and RSV updates for the next respiratory illness season in Fall 2026.*\n\n\n\n**Tip: **you can see the epidemic trends across the country when you** click on different states and territories **on the map to see details**.** Refer to [data notes](/respiratory-viruses/data/activity-levels.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for details about the data source.\n\n\n\n\n\n\n\n\n\n\n\n## Data notes\n\n\n\n\n\n\n\n\n\n### Level of respiratory illness activity\n\n\n\n\n\n\n - **Source**: National Syndromic Surveillance Program: [https://www.cdc.gov/nssp/index.html](/nssp/index.html).\n - The acute respiratory illness (ARI) metric categorizes the percentage of emergency department (ED) visits into five activity levels (Very Low, Low, Moderate, High, and Very High), helping people understand the extent of respiratory illness activity in an area. For a list of diagnostic codes for the ARI metric visit: [Acute Respiratory Illness Technical Brief](https://cdn.ymaws.com/www.cste.org/resource/resmgr/pdfs/CDC_Broad_Acute_Respiratory_.pdf).\n\n\n\n#### Methodology for using acute respiratory illness (ARI) as a surveillance metric to describe levels (categories) of emergency department (ED) visits:\n\n\n\nAcute respiratory illness (ARI) is a non-specific syndrome that captures a broad range of diagnoses from emergency department visits for respiratory illnesses, ranging from the common cold to infections that can be severe including COVID-19, influenza, and respiratory syncytial virus (RSV). An ARI-related metric classifies the percentage of ED visits due to ARI into 5 levels (categories): Very Low, Low, Moderate, High, and Very High at the regional, state, and local levels.\n\n\n - For each of the 10 U.S. Department of Health and Human Services Regions separately, we identified the weeks with the lowest activity for respiratory illnesses. This was done using clinical and public health laboratory test positivity data for COVID-19 and RSV from National Respiratory and Enteric Virus Surveillance System (NREVSS), and public health laboratory data from [FluView](https://gis.cdc.gov/grasp/fluview/fluportaldashboard.html), excluding H5, for recent surveillance years (2023-2024, 2024-2025, and 2025-2026 defined as epidemiologic Week 27 through Week 26 of the following calendar year). The lowest activity weeks serve as the reference periods.\n - Lowest activity for COVID-19 and RSV: identified as weeks in a given year when, for at least two consecutive weeks, <1% of tests for COVID-19 and RSV are positive.\n - Lowest activity for influenza: identified as weeks in a given year when, for at least two consecutive weeks, <2% of tests for influenza in those weeks are positive.\n - Week 27 through Week 26 of the following calendar year was used to define a surveillance year in order to capture summer COVID-19 activity as the start of a given season.\n - Lowest activity weeks for ARI were identified as weeks when COVID-19, influenza, and RSV were all identified as having low activity according to their separate thresholds.\n\n\n - For each state within a region, the reference periods were used to calculate the values that created the levels (categories) for the 2026-2027 surveillance year.\n\n\n - First, we calculated the weekly percentage of ED visits attributed to each pathogen and ARI overall within the identified lowest activity periods.\n - Next, we calculated the mean, M, and standard deviation, S, attributed to each pathogen and ARI overall within the identified lowest activity periods. The mean was considered the baseline value for each state and was used as the top value for the Very Low category.\n - Then, we computed the maximum number of standard deviations above the mean for any observed week over all weeks in the three previous seasons (N = (maximum number of standard deviations - M) / S).\n - The maximum number of standard deviations (N) was divided by 4 and multiplied by the standard deviation (S = standard deviation). This value was denoted as D, so D = (N / 4) * S.\n\n\n - Using X = percent of ED visits in a week for each pathogen and ARI overall, we classified activity levels as follows:\n - Very Low: X <= M, activity at or below baseline\n - Low: M < X <= M + D\n - Moderate: M + D < X <= M + 2D\n - High: M + 2D < X <= + 3D\n - Very High: M + 3D < X\n\n\n - **Missouri:** Due to data quality issues, Missouri's historical data before MMWR Week 10 of 2025 (March 2-8, 2025) could not be used for computing levels, thus leaving insufficient data. To address this, data from the rest of HHS Region 7 (Iowa, Kansas, and Nebraska) were used in place of Missouri's own before Week 10 of 2025 to compute the 2026-2027 levels for Missouri; for Week 10 of 2025 and later in the historical baseline years, Missouri's data was used.\n - **Iowa:** Due to a change in HIE vendors, the data feed from Iowa to NSSP was terminated on May 6, 2026. Therefore, only data through the week ending May 2, 2026 is considered and the partial week from May 3 to 9, 2026 is not included. Data and levels for the weeks ending May 9, 2026 and later will show as Data Unavailable.\n\n\n\n#### Hospital service areas (HSAs)\n\n\n\nHSAs were created by CDC's National Center for Health Statistics (NCHS) in 1996. An HSA is an area that is relatively self-contained with respect to hospital care. There are 949 HSAs. HSAs can vary in size, encompassing a single city, a county or a larger region within a state. Areas with higher population concentrations may have smaller HSAs to ensure adequate healthcare access, while sparsely populated regions might have larger HSAs that cover a broader geographical area. The National Institutes of Health National Cancer Institute (NCI) modified the HSA designations so that any HSA that crossed state or Surveillance, Epidemiology, and End Results (SEER) Registry boundaries was split so that all counties from one HSA were in one state and/or SEER Registry. The NCI SEER dataset can be accessed here: [Health Service Areas (HSA) - SEER Datasets (cancer.gov)](https://seer.cancer.gov/seerstat/variables/countyattribs/hsa.html)\n\n\n\n#### Display criteria for sub-state levels (categories)\n\n\n - Jurisdictions may elect not to display sub-state ED visit data for a variety of reasons.\n - Data from HSAs with fewer than 30% of hospitals participating in NSSP are suppressed to ensure a minimum level of representativeness.\n - Sub-state display of levels (categories) is further limited to ensure that calculations are stable and based on having a sufficient number of total ED visits. For each state, a minimum number of total ED visits (V) is defined as V = 1/D, where D = maximum number of standard deviations above the mean for any observed week divided by 4 (see above). This value of V is determined separately for COVID-19, influenza, RSV, and ARI overall for each state.\n - To assess if an HSA meets the criteria for classification based on sufficient data, data weeks from Week 1 to Week 26 of 2026 were considered. If the total number of ED visits in an HSA during these weeks was equal to or greater than the corresponding V value, it indicated sufficient data. However, if the total number of weeks meeting this minimum count fell below 80% (21 out of 26 weeks), the level (category) was not displayed for that HSA in any week. The percentage of ED visits for COVID-19, influenza, or RSV may still be displayed even if the level (category) is not displayed.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Percent of positive tests for viral respiratory pathogens\n\n\n\n\n\n\n - **Sources**: COVID-19 and RSV: National Respiratory and Enteric Virus Surveillance System ([NREVSS](/nrevss/php/dashboard/index.html)), a sentinel network of laboratories located through the US, includes clinical, public health and commercial laboratories. Flu: Clinical laboratory test results from NREVSS and flu collaborating laboratories; more details about [influenza virologic surveillance](/fluview/overview) are available.\n\n\n\n\nData is preliminary and may change as more reports are received. The most recent 3 weeks in gray are more likely to change because of delays in reporting. Data represents laboratory tests performed, not individual people. The data are reported across the country in all regions.\n\n\n\nThe percent of positive tests is calculated by dividing the number of positive tests by the total number of tests given, then multiplying by 100 [(# of positive tests/total tests) x 100].\n\n\n\nRSV and COVID-19 are limited to nucleic acid amplification tests (NAATs), also listed as polymerase chain rection tests (PCR). Participating laboratories report weekly to CDC the total number of COVID-19, flu, and RSV tests performed that week and the number of those tests that were positive.\n\n\n - COVID-19 laboratory data is available for [download](https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-COVID-19-Nucleic-Acid-Amplif/gvsb-yw6g/about_data).\n - RSV laboratory data are available for [download](https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-Respiratory-Syncytial-Virus-/3cxc-4k8q/about_data).\n - Flu laboratory data are available for [download](https://www.cdc.gov/fluview/overview/fluview-interactive.html?CDC_AAref_Val=%5BREDACTED%5D).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Wastewater viral activity level\n\n\n\n\n\n\n\nThe map shows the Wastewater Viral Activity Level across US states and territories. Activity levels indicate how much virus is currently detected in the wastewater – ranging from very low to very high. Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing, and before people who are sick go to their healthcare provider or hospital. It can also detect infections in people without symptoms. For more information, see [Data Methods](https://www.cdc.gov/wastewater/about-data/index.html).\n\n\n\nData representing less than 5% of the population has a hatching, or lined, pattern on the map, indicating the wastewater viral activity level may not show the full picture for that state or territory. States or territories without sufficient data are indicated as \"No data\". This can be because data was not reported from the state or territory, or the monitored sites do not have enough data to calculate the wastewater viral activity level.\n\n\n\nWastewater data will not include waste that may be disposed of outside the wastewater system, such as dirty diapers.\n\n\n\n#### Data limitations for flu A\n\n\n\nWastewater data cannot determine the source of flu A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow). Wastewater testing for flu displayed in these visuals only detects flu A viruses and does not distinguish between flu A subtypes (seasonal flu A[H1N1] virus, seasonal flu A[H3N2] virus and avian flu A[H5] virus).\n\n\n\nFor more data limitations, see [Data Methods](https://www.cdc.gov/nwss/about-data.html#[REDACTED]).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### ED visits for viral respiratory illness\n\n\n\n\n\n\n\nSource: National Syndromic Surveillance Program: [https://www.cdc.gov/nssp/index.html](https://www.cdc.gov/nssp/index.html)\n\n\n\nThere are no data available for the following states/territories: Guam and South Dakota. for additional information, you can read [Companion Guide: NSSP Emergency Department Data on Respiratory Illness](https://archive.cdc.gov/www_cdc_gov/ncird/surveillance/respiratory-illnesses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Epidemic trends\n\n\n\n\n\n\n\nSource: The Center for Forecasting and Outbreak Analytics: [Current Epidemic Trends (Based on Rt) for States](https://www.cdc.gov/cfa-modeling-and-forecasting/rt-estimates/index.html).\n\n\n\nThe epidemic trend is based on *Rt*, the time-varying reproductive number. *Rt *measures disease transmission. If *Rt *is above 1, the number of infections is growing because, on average, each infected person is causing more than one new infection; if *Rt *is below 1, it indicates that infections are declining. *Rt *is estimated using data on ED visits reported through the [National Syndromic Surveillance Program (NSSP](https://www.cdc.gov/nssp/index.html)).\n\n\n\nThe map's color coding reflects whether infections are likely to increase or decrease:\n\n\n - Dark purple: Infections are growing\n - Purple: Infections are likely growing\n - Gray: Infections are likely not changing\n - Green: Infections are likely declining\n - Dark green: Infections are declining\n\n\n\nThe accuracy of *Rt *can be temporarily affected by changes in how many people with infections go to EDs, for example a new variant or strain emerges that causes more severe disease, and by changes in testing or reporting practices. The data used to estimate *Rt *are updated frequently, and initially reported counts might later be revised. The data are manually reviewed each week, and extreme or unexpected values that appear unreliable are not included.\n\n\n\n*Rt is* not estimated for states in the following cases:\n\n\n - Jurisdictions with low ED facility participation or where diagnosis information is incomplete\n - Fewer than 10 ED visits for the disease were reported in the prior 2 weeks\n - Anomalies were detected in reported values\n - The model did not pass checks for reliability\n\n\n\nFor additional methods: [Behind the Model: CDC's Tools to Assess Epidemic Trends | CFA: Behind the Model | CDC](https://www.cdc.gov/cfa-behind-the-model/php/data-research/rt-estimates/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Explore source data\n\n\n - [State Map of Outpatient Respiratory Illness Activity](https://gis.cdc.gov/grasp/fluview/main.html)\n - [Outpatient Illness and Viral Surveillance](https://gis.cdc.gov/grasp/fluview/fluportaldashboard.html)\n - [COVID-19 Testing, Hospitalization, and Death Trends](https://covid.cdc.gov/covid-data-tracker/#[REDACTED])\n - [Weekly U.S. Influenza Surveillance Report](https://www.cdc.gov/fluview/index.html)\n - [Current Wastewater Viral Activity Level](https://www.cdc.gov/nwss/index.html)\n\n\n\n\n\n\n\n\n\n\n\n## On This Page\n\n\n\n\n - [Summary](#cdc_data_surveillance_section_1-summary)\n - [Level of respiratory virus activity](#cdc_data_surveillance_section_2-level-of-respiratory-virus-activity)\n - [Percent positive tests for respiratory viruses](#cdc_data_surveillance_section_6-percent-positive-tests-for-respiratory-viruses)\n - [Community viral activity level](#cdc_data_surveillance_section_3-community-viral-activity-level)\n - [ED visits for viral respiratory illness](#cdc_data_surveillance_section_4-ed-visits-for-viral-respiratory-illness)\n - [Epidemic trends](#cdc_data_surveillance_section_5-epidemic-trends)\n - [Data notes](#cdc_data_surveillance_section_7-data-notes)\n - [Explore source data](#cdc_data_surveillance_section_8-explore-source-data)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n Sept. 11, 2026\n\n\n\n\n\n [Sources and Page Info](#content-sources) [Print](#print) [Share](#share)\n\n # # # #\n\n\n\n\n\n\n\n [Facebook](https://www.facebook.com/) [LinkedIn](https://www.linkedin.com/) [Twitter](https://twitter.com/) [Syndicate](https://tools.cdc.gov/medialibrary/index.aspx#[REDACTED])\n\n\n\n\n\n\n\n\n\nContent Source\n\n [National Center for Immunization and Respiratory Diseases (NCIRD)](/ncird/index.html)\n\n\n\n About This Page\n\n\n\n Published: August 14, 2026\n\n\n\n Updated: September 11, 2026\n\nThis page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.\n\n\n\n\n\n Reviewed: September 11, 2026\n\nThe information on this page was last reviewed by subject matter experts to ensure accuracy.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## [** Respiratory Illnesses **](/respiratory-viruses/index.html)\n\n\n\nRespiratory illnesses affect the lungs and airways. 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{"dispatch_id": "toolu_015oft8kM1ZpGLSCtuBr7hNj", "elapsed": 0.031141347, "error": "", "result": {"content": "Severe Viral Respiratory Illness | Respiratory Illnesses | CDC\n\n [Skip directly to site content](#content) [Skip directly to search](#cdc-search__input)\n\n\n\n\n\n\n\n\n\n\n\n\n\n  An official website of the United States government\n\n [Here's how you know](#gov-notice)\n\n\n\n\n\n\n\n \n\n **Official websites use .gov**\n\nA **.gov** website belongs to an official government organization in the United States.\n\n\n\n\n\n\n\n \n\n **Secure .gov websites use HTTPS**\n\nA **lock** ( ** ) or **https://** means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n Explore This Topic\n\n Search\n\n Search Clear Search\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [For Everyone](/respiratory-viruses/index.html)\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View all](/respiratory-viruses/site.html#gen)\n\n\n\n\n\n\n\n\n\n [Health Care Providers](/respiratory-viruses/hcp/index.html)\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View all](/respiratory-viruses/site.html#hcp)\n\n\n\n\n\n\n\n\n\n [Public Health](/respiratory-viruses/site.html#php)\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View all](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n ** Related Topics: **\n\n\n\n [COVID-19](/covid/index.html) | [Seasonal Flu](/flu/index.html) | [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n [](https://www.cdc.gov)\n\n *search*\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html) Menu **\n\n\n\n\n\n\n\n clear **search\n\n\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n - [View All](/respiratory-viruses/site.html#gen) [Home](/respiratory-viruses/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Health Care Providers\n\n\n\n\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n - [View All](/respiratory-viruses/site.html#hcp) [Home](/respiratory-viruses/hcp/index.html)\n\n\n\n\n\n\n\n\n\n\n\n Public Health\n\n\n\n\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n - [View All](/respiratory-viruses/site.html#php)\n\n\n\n\n\n\n\n\n\n\n\n Related Topics\n\n\n\n\n\n\n - [COVID-19](/covid/index.html)\n - [Seasonal Flu](/flu/index.html)\n - [Respiratory Syncytial Virus (RSV)](/rsv/index.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Respiratory Illnesses](/respiratory-viruses/index.html)\n\n\n\n\n\n \n\n\n\n\n\n\n\n\n\n\n\n [About](/respiratory-viruses/about/index.html) [Risk Factors](/respiratory-viruses/risk-factors/index.html) [Prevention](/respiratory-viruses/prevention/index.html) [Treatment](/respiratory-viruses/treatment/index.html) [Caring for Yourself](/respiratory-viruses/immune-health/index.html) [Data and Trends](/respiratory-viruses/data/index.html) [Communication Resources](/respiratory-viruses/communication-resources/index.html) View Menu\n\n\n\n\n\n\n\n\n\n\n\n# Severe Viral Respiratory Illness\n\n\n\n\n\n\n\n\n\n For Everyone\n\n\n\n Sept. 11, 2026\n\n\n\n [Español](/respiratory-viruses/es/data/gravedad.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## At a glance\n\n\n\n\n\n\n - See how severe respiratory illnesses are by reviewing the latest data on hospitalizations and deaths caused by respiratory viruses.\n - Understand how illness severity is changing by tracking trends in your state and nationwide.\n - Discover why these numbers matter; understanding the impact helps you make informed decisions to protect yourself and your family.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Summary\n\n\n\n\n\n\n\n\n\n## Hospitalization numbers\n\n\n\nThis website displays two sources of hospitalization data. The first source is the [CDC's National Healthcare Safety Network](https://www.cdc.gov/nhsn/psc/hospital-respiratory-reporting.html) (NHSN) and the second is [CDC's Respiratory Virus Hospitalization Surveillance Network](/resp-net/dashboard/index.html) (RESP-NET).\n\n\n\n### Hospital admission levels\n\n\n\nCDC monitors the number of hospital admissions for [COVID-19](/covid/index.html), [influenza](/flu/index.html) (flu), and [RSV](/rsv/index.html). The color bar at the top of the map shows the hospitalization level associated with each color. **Click on the tab for COVID-19, influenza, or RSV to see the levels for each disease. Hover over a state to see the levels and additional details**. Refer to [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more information about data sources.\n\n\n\n### Hospitalization rates reported by hospitals\n\n\n\nCDC tracks the weekly hospitalization rate of respiratory virus-associated hospitalizations per 100,000 people reported to [CDC's National Healthcare Safety Network](https://www.cdc.gov/nhsn/psc/hospital-respiratory-reporting.html) (NHSN). Forecasts of future emergency department visits and hospital admissions are available for [COVID-19](https://www.cdc.gov/cfa-modeling-and-forecasting/covid19-data-vis/index.html?tab=%5BREDACTED%5D), [influenza](https://www.cdc.gov/flu-forecasting/data-vis/current-week.html), and [RSV](https://www.cdc.gov/cfa-modeling-and-forecasting/rsv-data-vis/index.html?tab=%5BREDACTED%5D).\n\n\n\n**Click the drop down at the top of the chart to select the geographic area you are interested in.** **You can move your mouse over the graph to view additional details.** Information about each respiratory illness is in a different color. *Open circles indicate fewer than 80% of hospitals in that area have reported illness numbers.*\n\n\n\nPreliminary data are shaded in gray. Refer to [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more information about data sources.\n\n\n\n\n\n### Hospitalization rates from a network of hospitals\n\n\n\nBelow, you'll find the weekly hospitalization rates of respiratory virus-associated hospitalizations per 100,000 people from [RESP-NET](/resp-net/dashboard/).\n\n\n\n**Click the box at the top of the chart** to see information about different states or territories. Information about each respiratory illness is in a different color. **Move your mouse over the chart and more information for each week will appear**. Because reporting may be delayed, models estimate what rates would be if all data were complete. Modeled median estimates are shown with dashed lines. Refer to [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All) for more about data sources.\n\n\n\n\n\n\n\n\n\n\n\n## Viral respiratory deaths in the United States\n\n\n\nThe chart below shows the weekly percentages of total deaths associated with COVID-19, influenza (flu), and RSV. Each respiratory illness is in a different color. **Move your mouse over the chart and more information for each week will appear.** Data from some recent weeks may be incomplete because of reporting delays; these weeks are shaded gray. For more information about the data source, refer to the [data notes](/respiratory-viruses/data/illness-severity.html#:~:text=Skipped%20data%20table.-,Data%20notes,-Expand%20All).\n\n\n\n\n\n\n\n\n\n## Data notes\n\n\n\n\n\n\n\n\n\n### Hospitalization rates: NHSN\n\n\n\n\n\n\n - **SOURCE: **National Healthcare Safety Network (NHSN)\n\n\n - **Data source description**: As of November 1, 2024, Hospital Respiratory Data (HRD; formerly Respiratory Pathogen, Hospital Capacity, and Supply data or 'COVID-19 hospital data') are required to be reported to HHS through CDC's NHSN based on updated requirements from the Centers for Medicare and Medicaid Services (CMS). NHSN monitors national and local trends in healthcare system stress and capacity for all acute care and critical access hospitals in the United States. Data reported by hospitals to NHSN represent aggregated counts and include metrics capturing information specific to hospital capacity, occupancy, hospitalizations, and admissions. Find more information about [reporting to NHSN](/nhsn/psc/hospital-respiratory-reporting.html).\n - **Data quality and timeliness: **CDC reviews reported data for completeness and errors and works with partners to update the data as needed. Data for the most recent two weeks may be affected by potential reporting delays; caution should be taken when interpreting these numbers.\n - **Metrics and inclusion criteria: **Many hospital types, including acute care and critical access hospitals, are included in the hospitalization rate and level calculations displayed on this page. Psychiatric, rehabilitation, and religious non-medical hospital types are excluded from calculations. Hospitals that report hospital admissions data for the entire week to NHSN during a given reporting week of Sunday through Saturday, are included in the jurisdiction admissions rate calculations and the accompanying visualizations.\n - **Respiratory virus-associated hospitalization rates** are calculated as the total number of new hospital admissions reported to NHSN for a given reporting week (Sunday – Saturday) divided by the total population for a given geography (per 100,000 people) according to the U.S. Census 2023 population estimates.\n - **Hospital admission levels** are determined based on the respiratory virus-associated hospitalization rates. The map shows the hospital admissions level for states and territories in the United States. This metric indicates whether the amount of people being admitted to the hospital for respiratory illnesses is very low, low, moderate, high, or very high for a given jurisdiction and reporting week (Sunday - Saturday). If you see increased hospital admission levels of COVID-19, flu, or RSV, it might indicate there is a higher risk of infection. For more information on the hospital admissions levels, see [NHSN hospital admissions methodology](/nhsn/psc/hospital-respiratory-reporting/data-methods.html).\n - **Percent of hospitals** **reporting **is calculated based on the number of hospitals reporting complete hospital admissions data (e.g., total admissions for the entire week) to NHSN for a given reporting week out of all hospitals that have reported to the system since the implementation of NHSN Hospital Respiratory Data in November 2024 (excluding the types listed above). Open circles on the time series display and hashed lines on the map display indicate less than 80% of hospitals reported numbers for a given jurisdiction in a reporting week. States or territories without sufficient data (less than 80% of hospitals reporting) are indicated as \"Data unavailable”.\n - The NHSN-based hospital bed occupancy from January 2022 to May 2024 was archived on May 10, 2024; it can be found at [Archived: Hospital Occupancy (cdc.gov)](https://archive.cdc.gov/www_cdc_gov/respiratory-viruses/data-research/dashboard/hospital-occupancy.html)[.](https://archive.cdc.gov/www_cdc_gov/respiratory-viruses/data-research/dashboard/hospital-occupancy.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Hospitalization rates: RESP-NET\n\n\n\n\n\n\n - **SOURCE:** Respiratory Virus Hospitalization Surveillance Network (RESP-NET).\n - Combined is the sum of COVID-19, flu, and respiratory syncytial virus (RSV) hospitalization rates.\n - Additional information, including the surveillance catchment area, is available on the [RESP-NET website](/resp-net/dashboard/index.html).\n - Hospitalization rates are calculated using the National Center for Health Statistics (NCHS) vintage bridged-race postcensal population estimates (for March–September 2020) or the U.S. Census vintage unbridged-race postcensal population estimates (for October 2020–present) for the counties or county equivalents included in the surveillance area.\n - RESP-NET surveillance for COVID-19 and RSV have been conducted year-round since 2020.\n - FluSurv-NET surveillance was traditionally conducted from October 1 through April 30 of the following year; however, starting with the 2025-26 season it will be conducted year-round.\n - Rates are likely to underestimate the impact of COVID-19, flu, and RSV on hospitalizations because of undertesting, differing provider or facility testing practices, and diagnostic test sensitivity. Rates presented do not adjust for testing practices which may differ by pathogen, age, race and ethnicity, and other demographic criteria.\n - The data points for the 3 most recent weeks of data represent estimates of the RESP-NET hospitalization rates, called \"[nowcasts](https://www.cdc.gov/cfa-behind-the-model/php/data-research/nowcasting.html),\" which are model-based estimates that account for delayed reporting of recent hospitalizations to estimate the RESP-NET rates from the partial data received so far. Observed data values, estimated ranges, and additional details about the model estimation are available on the [RESP-NET website](/resp-net/dashboard/index.html).\n - Because population estimates for ages 0–1 year are not available in smaller groupings, we split that number in two to estimate the populations for children younger than 6 months and for children 6 to less than 12 months.\n - Black, White, American Indian/Alaska Native, and Asian/Pacific Islander people were categorized as non-Hispanic; Hispanic people could be of any race. If Hispanic ethnicity was unknown, non-Hispanic ethnicity was assumed. Rates presented by race and ethnicity are calculated using records with known races. Those with missing or unknown race are excluded from race-specific estimates but are included in overall estimates.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Viral respiratory deaths\n\n\n\n\n\n\n - **SOURCE:** Provisional Deaths from the CDC's National Center for Health Statistics (NCHS) National Vital Statistics System (NVSS). Accessed from [CDC Wonder](https://wonder.cdc.gov/mcd-icd10-provisional.html).\n - Provisional data are non-final counts of deaths based on mortality data in NVSS. Data during recent periods are incomplete because of the gap in time between when a death occurs and when a death certificate is completed, submitted to NCHS, and processed for reporting. This delay can range from 1 week to 8 weeks or more, depending on the jurisdiction.\n - Definitions: When a person dies, the underlying and contributing causes are recorded in the form of ICD-10 codes. Cause-specific death counts are defined as those deaths with the designated ICD-10. In this case, the ICD-10 code definitions are as follows: COVID-19 (U07.1), flu (J09-J11), RSV (J12.1, J20.5, J21.0).\n - The death certificate data presented here provide a timely understanding of trends in deaths associated with each condition. However, it has been long recognized that only counting deaths where flu was recorded on death certificates would [underestimate flu's overall impact on mortality](/flu-burden/php/about/how-cdc-estimates.html). Flu can lead to death from other causes, such as pneumonia and congestive heart failure; however, it may not be listed on the death certificate as a contributing cause for multiple reasons, including a lack of testing. Therefore, CDC has an established history of using models to [estimate influenza-associated death totals](/flu-burden/php/data-vis/). In the fall of 2024, CDC released [COVID-19](/covid/php/surveillance/burden-estimates.html) and [RSV](https://www.cdc.gov/rsv/php/surveillance/burden-estimates.html) estimated death totals.\n - Death data are displayed by date of death. Death data reported are based on the total number of deaths received and coded in a certain time period and may not represent all deaths that occurred in that period. Death counts are updated as additional data are received.\n - Percent of deaths is not presented for weeks where death counts are between 1-9 in accordance with NCHS data confidentiality standards.\n - Provisional death data represent deaths among U.S. residents and occurring in the 50 states, plus the District of Columbia. Assignment to a geographic area is based on the place of residence listed on the death certificate.\n - The percentage of all reported deaths that are attributed as COVID-19, flu, and RSV is calculated as the number of COVID-19, flu, and RSV deaths divided by the number of deaths from all causes multiplied by 100. The percentage of deaths is less affected by incomplete reporting in recent weeks because death certificate data from natural causes of death and all causes have similar timeliness.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Explore source data\n\n\n - [RESP-NET Respiratory Virus Hospitalizations Dashboard](/resp-net/dashboard/index.html)\n - [NHSN Hospital Respiratory Data Dashboard](/nhsn/psc/hospital-respiratory-dashboard.html)\n - [Influenza Hospitalizations Dashboards](https://gis.cdc.gov/GRASP/Fluview/FluHospRates.html)\n - [RSV Hospitalizations Dashboard](/rsv/php/surveillance/rsv-net.html)\n - [Estimates of COVID-19 Burden](/covid/php/surveillance/burden-estimates.html)\n - [COVID-19 Death Data](/nchs/nvss/vsrr/COVID19/index.htm)\n\n\n\n\n\n\n\n\n\n\n\n## On This Page\n\n\n\n\n - [Summary](#cdc_data_surveillance_section_1-summary)\n - [Hospitalization numbers](#cdc_data_surveillance_section_2-hospitalization-numbers)\n - [Viral respiratory deaths in the United States](#cdc_data_surveillance_section_3-viral-respiratory-deaths-in-the-united-states)\n - [Data notes](#cdc_data_surveillance_section_4-data-notes)\n - [Explore source data](#cdc_data_surveillance_section_5-explore-source-data)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n Sept. 11, 2026\n\n\n\n\n\n [Sources and Page Info](#content-sources) [Print](#print) [Share](#share)\n\n # # # #\n\n\n\n\n\n\n\n [Facebook](https://www.facebook.com/) [LinkedIn](https://www.linkedin.com/) [Twitter](https://twitter.com/) [Syndicate](https://tools.cdc.gov/medialibrary/index.aspx#[REDACTED])\n\n\n\n\n\n\n\n\n\nContent Source\n\n [National Center for Immunization and Respiratory Diseases (NCIRD)](/ncird/index.html)\n\n\n\n About This Page\n\n\n\n Published: April 24, 2026\n\n\n\n Updated: September 11, 2026\n\nThis page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.\n\n\n\n\n\n Reviewed: September 11, 2026\n\nThe information on this page was last reviewed by subject matter experts to ensure accuracy.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## [** Respiratory Illnesses **](/respiratory-viruses/index.html)\n\n\n\nRespiratory illnesses affect the lungs and airways. Get information on common causes, prevention actions, and current levels of illness in your community.\n\n [View All](/respiratory-viruses/site.html)\n\n\n\n\n\n\n\n\n\n### [For Everyone](/respiratory-viruses/index.html#gen)\n\n\n - [About](/respiratory-viruses/about/index.html)\n - [Risk Factors](/respiratory-viruses/risk-factors/index.html)\n - [Prevention](/respiratory-viruses/prevention/index.html)\n - [Treatment](/respiratory-viruses/treatment/index.html)\n - [Caring for Yourself](/respiratory-viruses/immune-health/index.html)\n - [Data and Trends](/respiratory-viruses/data/index.html)\n - [Communication Resources](/respiratory-viruses/communication-resources/index.html)\n\n\n\n\n\n\n\n\n\n### [Health Care Providers](/respiratory-viruses/hcp/index.html#hcp)\n\n\n - [Clinical Overview](/respiratory-viruses/hcp/clinical-overview/index.html)\n - [Talking with Patients](/respiratory-viruses/hcp/conversation-tips/index.html)\n\n\n\n\n\n\n\n### [Public Health](/respiratory-viruses/site.html#php)\n\n\n - [Communication Toolkit](/respiratory-viruses/php/toolkit/index.html)\n\n\n\n\n\n\n\n\n\n\n\n ** [Sign up for Email Updates](https://tools.cdc.gov/campaignproxyservice/subscriptions.aspx#[REDACTED]) **\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Contact Us](#contactUs)\n\n\n\n [Contact Us](https://www.cdc.gov/cdc-info/index.html)\n - [Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n\n\n [About CDC](#aboutCDC)\n\n\n\n [About CDC](https://www.cdc.gov/about/)\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n\n\n\n\n\n [Policies](#policies)\n\n\n\n\n\n\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n\n\n\n\n - 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[Call 800-232-4636](tel:800-232-4636)\n - [Contact CDC](https://www.cdc.gov/cdc-info/index.html)\n\n\n\n [About CDC](#mobile-footer-aboutCDC)\n\n\n - [Pressroom](https://www.cdc.gov/media/)\n - [Organization](https://www.cdc.gov/about/organization/)\n - [Budget & Funding](https://www.cdc.gov/budget/)\n - [Careers & Jobs](https://jobs.cdc.gov/index.html)\n - [About CDC](https://www.cdc.gov/about/)\n\n\n\n [Policies](#mobile-footer-policies)\n\n\n - [Accessibility](https://www.cdc.gov/other/accessibility.html)\n - [External Links](https://www.cdc.gov/Other/disclaimer.html#[REDACTED])\n - [Privacy](https://www.cdc.gov/other/privacy.html)\n - [Web Policies](https://www.cdc.gov/Other/policies.html)\n\n\n - [FOIA](https://www.cdc.gov/foia/)\n - [OIG](https://oig.hhs.gov/)\n - [No Fear Act](https://www.cdc.gov/oeeowe/no-fear-act/)\n - [Nondiscrimination](https://www.cdc.gov/other/nondiscrimination.html)\n - [Vulnerability Disclosure Policy](https://www.hhs.gov/vulnerability-disclosure-policy/index.html)\n\n\n\n [Languages](#mobile-footer-languages)\n\n\n\nLanguages\n\n\n - [Español](https://www.cdc.gov/spanish/)\n\n\n\nLanguage Assistance\n\n\n - [Español](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [繁體中文](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tiếng Việt](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [한국어](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Tagalog](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Русский](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [العربية](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Kreyòl Ayisyen](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Français](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Polski](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Português](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - [Italiano](https://www.cdc.gov/other/language-assistance.html#[REDACTED])\n - 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{"dispatch_id": "toolu_01YRTjDoYyhZenbwwWJtVWY3", "handle": "", "panel_kind": "", "parent_dispatch_id": "", "tool_input": {"final": true, "in_response_to": "bd786383", "message": "CDC's [respiratory data channel](https://www.cdc.gov/respiratory-viruses/data/) updated today, Sept 11, 2026. Overall acute respiratory illness is \"very low.\" COVID-19 is elevated and increasing nationally with hospitalizations still low, flu and RSV are low, and rhinovirus/enterovirus plus group A strep are rising.\n\nThe page itself only gives that narrative, so I pulled the underlying lab numbers from CDC's open data for the newest week (ending Sept 5) vs the prior week (Aug 29):\n\n**COVID-19 test positivity**\n\n| Area | Sep 5 | Aug 29 |\n|---|---|---|\n| National | 5.55% | 5.59% |\n| Region 6 (TX, LA, OK, AR, NM) | 14.48% | 9.81% |\n| Region 9 (CA, AZ, NV, HI) | 9.36% | 9.66% |\n| Region 10 (Pacific NW) | 6.31% | 6.92% |\n| Region 4 (Southeast) | 4.59% | 6.12% |\n| Region 3 (mid-Atlantic) | 3.26% | 3.30% |\n| Region 8 (Mountain) | 2.98% | 3.22% |\n| Region 5 (Midwest) | 2.87% | 2.72% |\n| Region 1 (New England) | 2.81% | 3.03% |\n\nHot spot: the South Central states, where positivity jumped about 4.7 points in one week. The West stays high but flat. National is essentially unchanged week over week.\n\n**RSV**: national PCR positivity 0.5%, up from 0.4%. Highest are Region 4 at 0.9% and Region 9 at 0.7%. Still minimal everywhere.\n\n**Flu**: low nationally, and CDC's flu and RSV epidemic-trend modeling is paused until the 2026-27 season starts this fall, so there's no regional flu signal yet.\n\nSources: [COVID positivity](https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-COVID-19-Nucleic-Acid-Amplif/gvsb-yw6g/about_data), [RSV positivity](https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-Respiratory-Syncytial-Virus-/3cxc-4k8q/about_data). Recent weeks are preliminary and get revised."}, "tool_name": "send_message"}
{"dispatch_id": "toolu_01YRTjDoYyhZenbwwWJtVWY3", "elapsed": 17.124333054, "error": "", "result": "Delivered (confirmed) as 4 messages. Your draft was polished into texting register, so the wording differs from what you wrote; this is exactly what the user sees:\n1) CDC's respiratory data updated Sept 11. COVID is elevated and rising nationally, flu and RSV are low, but the South is spiking.\n2) ### COVID-19 test positivity · CDC weekly lab data\n\n| Area | Sep 5 | Aug 29 |\n|---|---|---|\n| National | 5.55% | 5.59% |\n| Region 6 (TX, LA, OK, AR, NM) | 14.48% | 9.81% |\n| Region 9 (CA, AZ, NV, HI) | 9.36% | 9.66% |\n| Region 10 (Pacific NW) | 6.31% | 6.92% |\n| Region 4 (Southeast) | 4.59% | 6.12% |\n| Region 3 (mid-Atlantic) | 3.26% | 3.30% |\n| Region 8 (Mountain) | 2.98% | 3.22% |\n| Region 5 (Midwest) | 2.87% | 2.72% |\n| Region 1 (New England) | 2.81% | 3.03% |\n3) Region 6 jumped 4.7 points in one week. The West stays high but flat. RSV is 0.5% nationally, highest in Region 4 at 0.9%. Flu is still minimal.\n4) https://www.cdc.gov/respiratory-viruses/data/\nhttps://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-Respiratory-Syncytial-Virus-/3cxc-4k8q/about_data\nThese are your words now, and this is the whole reply: the delivery layer chose its density and shape by design. Never dispute, re-explain, or apologize for the phrasing, and never send a supplement to restore detail it left out. Only a final send settles its request. Never chase wording with another send. If a fact in it is wrong and would change what the user does, correct it when their next message arrives.\n\nNothing else is open: no request awaits a reply and no work is running. A response with no tool call ends the run.\nanswers: bd786383-d4c8-4d57-a697-aba56eee8cb8", "status": "completed", "tool_name": "send_message"}
CDC's respiratory data updated Sept 11. COVID is elevated and rising nationally, flu and RSV are low, but the South is spiking.
### COVID-19 test positivity · CDC weekly lab data
| Area | Sep 5 | Aug 29 |
|---|---|---|
| National | 5.55% | 5.59% |
| Region 6 (TX, LA, OK, AR, NM) | 14.48% | 9.81% |
| Region 9 (CA, AZ, NV, HI) | 9.36% | 9.66% |
| Region 10 (Pacific NW) | 6.31% | 6.92% |
| Region 4 (Southeast) | 4.59% | 6.12% |
| Region 3 (mid-Atlantic) | 3.26% | 3.30% |
| Region 8 (Mountain) | 2.98% | 3.22% |
| Region 5 (Midwest) | 2.87% | 2.72% |
| Region 1 (New England) | 2.81% | 3.03% |
Region 6 jumped 4.7 points in one week. The West stays high but flat. RSV is 0.5% nationally, highest in Region 4 at 0.9%. Flu is still minimal.
https://www.cdc.gov/respiratory-viruses/data/
https://data.cdc.gov/Laboratory-Surveillance/Percent-Positivity-of-Respiratory-Syncytial-Virus-/3cxc-4k8q/about_data