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Overview

The National Respiratory and Enteric Virus Surveillance System (NREVSS) monitors viral activity in the United States. In this surveillance system, participating U.S. laboratories voluntarily report weekly to ÐÇ¿ÕÓéÀÖ¹ÙÍø the total number of tests performed to detect these viruses and the total number of those tests that were positive. They also report the specimen type, location, and week of collection. NREVSS allows for timely analysis of data to monitor viral seasons and circulation patterns.

All data graphs on this site are updated weekly.

NREVSS Dashboard

1. Select a View Information can be viewed as national data (all participating NREVSS laboratories) or filtered by HHS region, surveillance year, or virus. To view respiratory or enteric virus data, select the respective view.
2. Select Virus Select one or more viruses.

How it's used

NREVSS was created in the 1980s to monitor seasonal trends in respiratory virus activity and was later expanded to include select enteric viruses. Influenza testing data reported to NREVSS is integrated with ÐÇ¿ÕÓéÀÖ¹ÙÍø Influenza Surveillance.

Each week, participating U.S. laboratories from university and community hospitals, state and county public health departments, and commercial entities voluntarily report:

• the total number of tests performed
• the test type used for detection
• the number of those tests with positive results

Respiratory test results on the dashboard only include results from nucleic acid amplification tests (NAATs), also referred to as polymerase chain reaction (PCR) detection methods. ÐÇ¿ÕÓéÀÖ¹ÙÍø makes NREVSS data available through this website.

ÐÇ¿ÕÓéÀÖ¹ÙÍø also publishes periodic summaries and alerts based on NREVSS data in ÐÇ¿ÕÓéÀÖ¹ÙÍø's Morbidity and Mortality Weekly Report and other peer-reviewed journals.

We anticipate that NREVSS will continue to play an important role in describing the temporal and geographic circulation patterns of respiratory and enteric viruses—including changes in the typical annual circulation patterns and identifying viral outbreaks. NREVSS has proven to be a relatively simple and practical surveillance system that will continue to be an important part of ÐÇ¿ÕÓéÀÖ¹ÙÍø's efforts to treat, prevent, and control respiratory and enteric viral diseases.

Viruses monitored in NREVSS

The following viruses are monitored by NREVSS:

• SARS-CoV-2, the virus that causes COVID-19
• Respiratory syncytial virus (RSV)
• Influenza viruses
• Human parainfluenza viruses (PIV) (types 1, 2, 3, and 4)
• Human metapneumovirus (HMPV)
• Rhinovirus/enterovirus (RV/EV)
• Respiratory adenoviruses
• (types 299E, NL63, OC43, HKU1)
• Rotavirus
• Norovirus

Key surveillance reports

Severe Acute Respiratory Syndrome Coronavirus Type-2 Reports

• For more information on SARS-CoV-2, the virus that causes COVID-19, visit the .

Influenza Activity and Surveillance

• A weekly influenza surveillance report and a dynamic visualization allowing user access to influenza data are available here.

Common Human Coronavirus Surveillance Reports

• . MMWR. October 2022 / Vol 28 / No 10 (7 pages)
• Killerby ME, Biggs HM, Haynes A, Dahl RM, Mustaquim D, Gerber SI, Watson JT. . J Clin Virol. 2018 April;101: 52-6

Adenovirus Surveillance Reports

• Abdirizak F, Winn AK, Parikh R, et al. Surveillance of Human Adenovirus Types and the Impact of the COVID-19 Pandemic on Reporting — United States, 2017–2023. MMWR Morb Mortal Wkly Rep 2024;73:1136–1141.

Human Metapneumovirus Surveillance Reports

• Edwards KM, Zhu Y, Griffin MR, Weinberg, GA, Hall CB, Szilagyi PG, Staat MA, Iwane MK, Prill MM, Williams JV, for the New Vaccine Surveillance Network (NVSN). . N Engl J Med. 2013;368:633-643
• Haynes AK, Fowlkes AL, Schneider E, Mutuc JD, Armstrong GL, Gerber SI. .Pediatrics. 2016; 137 (5): e20152927.
• More detail about human metapneumovirus and publications are available here: Human Metapneumovirus

Parainfluenza Virus Reports

• Olsen SJ, Winn AK, Budd AP, et al. Changes in Influenza and Other Respiratory Virus Activity During the COVID-19 Pandemic — United States, 2020–2021. MMWR Morb Mortal Wkly Rep 2021;70:1013–1019. DOI: .
• DeGroote NP, Haynes AK, Taylor C, Killerby ME, Dahl RM, Mustaquim D, Gerber SI, Watson JT. .J Clin Virol.2020;124:104261.
• Abedi GR, Prill MM, Langley GE, Wikswo ME, Weignburg GA, Curns AT, Schneider E..J Ped Infect Dis. 2016;5:7-13.
• Weinberg GA, Hall CB, Poehling KA, Edwards KM, Iwane MK, Bridges CB, Staat MA, Griffin MR, Szilagyi PG..J Pediatr. 2009;154:694-699
• More details about parainfluenza virus and publications are available here: HPIV Resources and References

RSV Surveillance Reports

• A summary of current respiratory virus level activity is also available here: Respiratory Virus Activity Levels (cdc.gov)
• MMWR Reports since 1984 on Respiratory Syncytial Virus Activity and Respiratory Syncytial Virus Surveillance are searchable here: Reports by Topic | MMWR (cdc.gov)
• More detailed information on respiratory syncytial virus and resources are available here: RSV References and Resources
• Update: Respiratory Virus Surveillance — United States, 1984. MMWR. March 23, 1984 / Vol 33 / No 11
• Hamid S, Winn A, Parikh R, et al. Seasonality of Respiratory Syncytial Virus — United States, 2017–2023. MMWR Morb Mortal Wkly Rep 2023;72:355–361. DOI: .
• Rose EB, Wheatley A, Langley G, Gerber S, Haynes A. Respiratory Syncytial Virus Seasonality — United States, 2014–2017. MMWR Morb Mortal Wkly Rep 2018;67:71–76. DOI: .
• More information on respiratory syncytial virus and resources are available here: RSV References and Resources

Rotavirus Surveillance Reports

• More detail about rotavirus and publications are available here.

Norovirus Surveillance Reports

• More detail about norovirus and publications are available here.