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Key Points
-- Seasonal influenza activity continues to decrease in most areas of the country.
- Influenza A activity is low across all HHS regions while the amount of and trends in influenza B activity vary by region.
-- Influenza A(H3N2) viruses are the most frequently reported influenza viruses overall this season.
-- Among 2,166 influenza A(H3N2) viruses collected since September 28, 2025, that underwent additional genetic characterization at CDC, 92.8% belonged to subclade K.
-- The cumulative influenza-associated hospitalization rate overall in FluSurv-NET is the third highest since the 2010-2011 season.
- Children younger than 18 years have the second highest cumulative hospitalization rate for that age group since the 2010-2011 season.
-- Twelve influenza-associated pediatric deaths occurring during the 2025-2026 season were reported to CDC this week, bringing the season total to 139 reported influenza-associated pediatric deaths.
-- Among children who were eligible for influenza vaccination and with known vaccination status, approximately 85% of reported pediatric deaths this season have occurred in children who were not fully vaccinated against influenza.
-- CDC's in-season severity assessment framework classified the season as moderate across all ages.
- CDC also assesses severity by three age groups: pediatric (0-17 years), adult (18-64 years), and older adults (≥65 years).
- At this point in the season, the pediatric age group is classified as having high severity, while both the adult and older adult age groups are classified as having moderate severity.
- These assessments are conducted each week during the season, and the season's severity assessment can change if activity should increase again.
-- CDC estimates that there have been at least 31 million illnesses, 370,000 hospitalizations, and 23,000 deaths from flu so far this season.
-- Influenza (flu) vaccination has been shown to reduce the risk of flu and its potentially serious complications.
- There is still time to get vaccinated against flu this season.
- Approximately 135 million doses of influenza vaccine have been distributed in the United States this season.
-- There are prescription flu antiviral drugs that can treat flu illness; those should be started as early as possible and are especially important for patients at higher risk for flu-related complications.1
-- Influenza viruses are among several viruses contributing to respiratory disease activity. CDC provides updated, integrated information about COVID-19, flu, and respiratory syncytial virus (RSV) activity on a weekly basis.
-- No new avian influenza A(H5) infections were reported to CDC this week. To date, person-to-person transmission of influenza A(H5) viruses has not been identified in the United States.
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Source:
Link: https://www.cdc.gov/fluview/surveillance/2026-week-13.html
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