Weekly Viral Respiratory Illness Snapshot

Provides a summary of the key viral respiratory illness findings for COVID-19, influenza, and RSV from the past week and access to additional information and figures.

Note: data summaries are based on CDC subject matter expert interpretation of publicly available findings across multiple data systems, some of which are not included in the data visualizations on these web pages.

The amount of respiratory illness (fever plus cough or sore throat) causing people to seek healthcare is elevated or increasing across most areas of the country.

Reported on Friday, December 8th, 2023.

Detailed Snapshot

The U.S. is experiencing elevated RSV activity, particularly among young children. COVID-19 activity has continued to increase, especially in the Midwest and Mid-Atlantic regions. Influenza activity continues to increase in most of the country with the southeast and south-central areas of the country reporting the highest levels of activity. Hospital bed occupancy for all patients, including within intensive care units, remains stable nationally.


Test positivity (percentage of tests conducted that were positive), emergency department visits, and hospitalizations remained elevated nationally. Emergency department visits for COVID-19 are highest among infants and older adults but are also elevated for young children.  A group of Omicron variants (XBB and its sublineages) are the predominant lineages detected in the U.S., with HV.1 being most common. The prevalence of a new BA.2.86 sub-lineage, JN.1, is projected to account for 15-29% of currently circulating variants. CDC continues to monitor HV.1, BA.2.86, and all other lineages.


Test positivity, emergency department visits, and hospitalizations continue to increase. Influenza A(H1N1) is the predominant influenza virus circulating although influenza A(H3N2) and influenza B viruses are also being reported.


Hospitalization rates remain elevated among young children and are increasing among older adults. To date, only 15.9% of adults 60+ report having received an RSV vaccine.


Although national vaccination coverage for COVID-19, influenza, and RSV vaccines increased slightly for children and adults compared to the previous week, overall vaccination coverage remains low for both groups. Vaccines are available and can help protect people from the most serious health effects of fall and winter viruses.

Special Update: Pediatric Pneumonia

CDC has continued to monitor increases in respiratory illness reported recently among children, including potential elevated rates of pediatric pneumonia. These reported increases do not appear to be due to a new virus or other pathogen but to multiple viral or bacterial causes that we expect to see during the respiratory illness season. CDC will continue to work closely with our state and local public health partners to maintain strong situational awareness and will provide updates, as needed.

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Activity Levels

Provides an update on how COVID-19, influenza, and RSV may be spreading nationally and in your state.

Vaccination Trends

Provides an update on receipt of vaccination and intent for vaccination for COVID-19 (children and adults), influenza (children and adults), and RSV (adults) based on weekly updated National Immunization Survey (NIS) survey responses.

Illness Severity

Provides an update on how respiratory viruses are contributing to serious health outcomes, like hospitalizations and deaths, both nationally and in your state. 

Groups Most Impacted

Provides an update on how COVID-19, influenza, and RSV illness, hospitalizations, and deaths are affecting different groups. 

Hospital Occupancy

Provides an update on current overall hospital occupancy levels and how patients hospitalized with COVID-19 or influenza are contributing to inpatient and intensive care unit bed use. 

Explore deeper data


Wastewater (sewage) data specific to SARS-CoV-2, the virus that causes COVID-19, are made available at the national, regional and state levels. Wastewater can be tested to detect traces of infectious diseases circulating in a community, even if people don’t have symptoms. These data can provide an early signal that infection levels may be increasing or decreasing in communities.

Nursing home

Data on COVID-19 cases and deaths among residents and staff of nursing homes are displayed at the national and state levels.

Forward Outlook

Estimated trends for COVID-19 and influenza infections and hospitalizations, based on modeling and forecasting, are made available at the national and state levels. Findings for current epidemic growth status, based on Rt estimates, and hospital admission forecasts are provided.