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Original site: www.cdc.gov/nwss/rv/InfluenzaA-nationaltrend.html | RestoredCDC.org is an independent project, not affiliated with CDC or any federal entity. Visit CDC.gov for free official information. Due to archival on January 6, 2025, recent outbreak data is unavailable. Videos are not restored. Access data.restoredcdc.org for restored data. Use of this site implies acceptance of this disclaimer.[More]About Us Report Bug Compare ContentSkip directly to site content Skip directly to searchEspañol | Other LanguagesHere's how you knowAn official website of the United States government Here's how you knowNational Wastewater Surveillance System (NWSS)National Wastewater Surveillance System (NWSS)Centers for Disease Control and Prevention. CDC twenty four seven. Saving Lives, Protecting People National Wastewater Surveillance System (NWSS)SearchSearch Menu Navigation MenuSubmitNational Wastewater Surveillance System (NWSS)* COVID-19 Wastewater Data+ BACKCOVID-19 Wastewater Data+ National and Regional Trends+ State and Territory Trends+ Current Wastewater Viral Activity Levels Map+ Variants in Wastewater+ National Wastewater Surveillance System (NWSS) Home* Influenza A Wastewater Data+ BACKInfluenza A Wastewater Data+ National Trends+ State and Territory Trends+ Current Wastewater Viral Activity Levels Map+ Wastewater Data for H5+ National Wastewater Surveillance System (NWSS) Home* RSV Wastewater Data+ BACKRSV Wastewater Data+ National Trends+ State and Territory Trends+ Current Wastewater Viral Activity Levels Map+ National Wastewater Surveillance System (NWSS) Home* Mpox Wastewater Data* CDC’s Wastewater (NWSS) Program+ BACKCDC’s Wastewater (NWSS) Program+ Centers of Excellence+ Communication Resources+ National Wastewater Surveillance System (NWSS) Home* How Wastewater Monitoring Works* About Wastewater Data* National Wastewater Surveillance System (NWSS) HomeNational Wastewater Surveillance System (NWSS)National Wastewater Surveillance System (NWSS) HomeWastewater data reporting may be reduced or delayed over the holiday season. Data will be updated as it becomes available.Wastewater surveillance may complement other existing human surveillance systems to monitor influenza. Wastewater data cannot determine the source of influenza 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).About CDC’s Wastewater Program (NWSS)How Wastewater Monitoring WorksWastewater Influenza A National TrendsInfluenza A Wastewater DataInfluenza A Wastewater Monitoring in the U.S.Table of ContentsSituational Summary* The ongoing avian influenza A (H5) (bird flu) outbreak in U.S dairy cows and poultry may be contributing to the moderate and high influenza (flu) A virus wastewater levels in some jurisdictions, based on reviewing multiple data sources. The risk to the public of avian influenza A (H5) is currently low.* Wastewater data for influenza A virus should be considered in combination with clinical sources of influenza A data.* Influenza A viruses include subtypes like avian influenza A(H5) virus and A(H1N1). Wastewater testing for overall influenza A virus cannot tell us what subtypes are present. Wastewater testing cannot tell us if the source of the influenza A virus is from humans, animals, or animal products.* Wastewater testing for influenza virus subtypes, including an H5 subtype, is underway across the United States. See Wastewater Data for Avian Influenza A(H5) for more information.* CDC and public health partners continue to investigate whether changing levels of influenza A virus in wastewater are related to seasonal influenza, the avian influenza A (H5) outbreak in animals, or both.What can wastewater data for influenza A virus tell us?* If influenza (flu) A virus is increasing or high in an area’s wastewater, public health officials also look to other data sources, like clinical and agricultural data, to understand whether the virus might be coming from humans (such as seasonal influenza) or animals (such as from an outbreak of bird flu).* Testing for influenza A virus in community wastewater can provide a signal that humans or animals may be infected with the virus.* Influenza A viruses include multiple subtypes (e.g., viruses with H1, H3, or H5). These include subtypes that cause seasonal influenza in people each year and subtypes that can cause outbreaks among both animals and people, such as bird flu.* Wastewater data do not identify whether detections or increases of influenza A virus are coming from humans, an animal product (like milk from an infected cow), or an animal (like a bird). Some sewer systems are more open to environmental input than others and may have animal inputs, and this can impact detections.* Wastewater testing for an influenza A(H5) subtype is happening across the United States. See Wastewater Data for Avian Influenza A(H5) for more information.2Nationally, the wastewater viral activity level for influenza A is currently very low .Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy.This chart shows national trends of wastewater viral activity levels of influenza A.1 Year6 Months45 DaysAll ResultsSkip Over Chart ContainerNo Data AvailableMinimalLowModerateHighVery HighVery LowLowModerateHighVery High06/01/2407/13/2408/24/2410/05/2411/16/2412/28/2402/08/2503/22/2505/03/25Week EndingNationalData from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.Data last updated 2024-12-26Data last updated 2025-05-08Skip Data TableData TableData table showing data for the chart figure.No DataWeek_Ending_Date Press command, modifier, or enter key to sort by Week_Ending_Date in ascending order National Press command, modifier, or enter key to sort by National in ascending order05/03/25 1.3704/26/25 1.4904/19/25 1.9104/12/25 2.4204/05/25 2.4103/29/25 2.8503/22/25 4.1603/15/25 5.1603/08/25 8.6803/01/25 11.9002/22/25 13.8802/15/25 18.6402/08/25 21.7402/01/25 21.4001/25/25 18.9001/18/25 13.0501/11/25 11.4801/04/25 11.7612/28/24 8.1912/21/24 5.6612/14/24 3.8012/07/24 2.3611/30/24 1.6711/23/24 1.6511/16/24 1.5311/09/24 1.3711/02/24 1.2210/26/24 1.1410/19/24 1.2010/12/24 1.1510/05/24 1.3209/28/24 1.3009/21/24 1.1609/14/24 1.1809/07/24 1.2408/31/24 1.2808/24/24 1.2608/17/24 1.2308/10/24 1.3608/03/24 1.2607/27/24 1.3707/20/24 1.4307/13/24 1.3507/06/24 1.2806/29/24 1.4406/22/24 1.3506/15/24 1.5406/08/24 1.6706/01/24 1.7605/25/24 1.7705/18/24 2.1005/11/24 2.4005/04/24 2.28Link to DatasetDownload Data (CSV)Skipped data table.About the DataWastewater 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 doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is minimal, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:* Up to 1.6 – Minimal* Up to 1.6 – Very Low* Greater than 1.6 and up to 4.5 – Low* Greater than 4.5 and up to 12.2 – Moderate* Greater than 12.2 and up to 20.1 – High* Greater than 20.1 – Very HighNational data represent the median values across all wastewater treatment plants. To learn more on how the wastewater viral activity level is calculated, see Data Methods.Data Limitations: Wastewater data cannot determine the source of influenza 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).Explore more Influenza A Wastewater Monitoring DataInfluenza A Current Wastewater Viral Activity LevelsWastewater Data for H5Wastewater Influenza A State and Territory TrendsOther Links* CDC’s Wastewater (NWSS) Program* How Wastewater Monitoring Works* About Wastewater Data* Mpox Wastewater Data* Current Activity LevelsLast Reviewed: December 6, 2024Source: Centers for Disease Control and Prevention* Syndicatehome National Wastewater Surveillance System (NWSS)* COVID-19 Wastewater Data plus icon+ National and Regional Trends+ State and Territory Trends+ Current Wastewater Viral Activity Levels Map+ Variants in Wastewater* Influenza A Wastewater Data plus icon+ National Trends+ State and Territory Trends+ Current Wastewater Viral Activity Levels Map+ Wastewater Data for H5* RSV Wastewater Data plus icon+ National Trends+ State and Territory Trends+ Current Wastewater Viral Activity Levels Map* Mpox Wastewater Data* CDC’s Wastewater (NWSS) Program plus icon+ Centers of Excellence+ Communication Resources* How Wastewater Monitoring Works* About Wastewater Data* About CDC* Contact Us* 800-232-4636Facebook Twitter Instagram LinkedIn Youtube Pinterest SnapchatFacebook Twitter Instagram LinkedIn Youtube Pinterest Snapchat RSS* CONTACT CDCContact UsCall 800-232-4636Email Us* ABOUT CDC+ About CDC+ Jobs+ Funding* POLICIES+ Accessibility+ External Links+ Privacy+ Policies+ Web Policies+ No Fear Act+ FOIA+ OIG+ No Fear Act+ Nondiscrimination+ Vulnerability Disclosure Policy+ CDC Archive+ Public Health Publications+ HHS.gov+ USA.gov* CONNECT WITH US+ Youtube+ Snapchat* LANGUAGES+ Español+ 繁體中文+ Tiếng Việt+ 한국어+ Tagalog+ Русский+ العربية+ Kreyòl Ayisyen+ Français+ Polski+ Português+ Italiano+ Deutsch+ 日本語+ فارسی+ English* U.S. Department of Health & Human Services* Accessibility* External Links* Privacy* Policies* Web Policies* FOIA* OIG* No Fear Act* FOIA* Nondiscrimination* OIG* Vulnerability Disclosure Policy* CDC Archive* Public Health Publications* HHS.gov* USA.govContent Credential×This image was edited or created using GenAI (generative artificial intelligence).Our experts review all images in an effort to ensure accuracy and quality before use.Learn more about CDC's usage of GenAI.Ending
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