The National Respiratory and Enteric Virus Surveillance System (NREVSS)

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The National Respiratory and Enteric Virus Surveillance System (NREVSS) is a laboratory-based system that monitors respiratory and enteric activity for the following viruses:

  • 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
  • Human coronaviruses (HCOV) (types 299E, NL63, OC43, HKU1)
  • Rotavirus
  • Norovirus

In this surveillance system, participating U.S. laboratories voluntarily report weekly to CDC 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. The graphs were last updated on May 3, 2024.

How to Use the 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.
  1. Select Virus
    Select one respiratory virus or any combination of the seven.

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 CDC 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

Reports on the dashboard only include results from either virus antigen detection or polymerase chain reaction (PCR) detection methods. CDC makes NREVSS data available through this website.

CDC also publishes periodic summaries and alerts based on NREVSS data in CDC’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 CDC’s efforts to treat, prevent, and control respiratory and enteric viral diseases.

Key Surveillance Reports

Severe Acute Respiratory Syndrome Coronavirus Type-2 Reports

Influenza Activity and Surveillance

Common Human Coronavirus Surveillance Reports

Human Metapneumovirus Surveillance Reports

Parainfluenzavirus Reports

RSV Surveillance Reports

Rotavirus Surveillance Reports

Norovirus Surveillance Reports

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