Which Flu Strain Is Circulating This Season?
The dominant circulating strain shifts from season to season and even within a single season, so this page focuses on how strain surveillance works and where to check live, authoritative data — rather than naming a specific strain that would quickly go out of date.
How strain surveillance works
National and international health agencies run continuous laboratory surveillance networks that track which influenza subtypes are circulating in a given region and how they’re evolving. This data informs both the composition of each season’s vaccine and public health guidance on severity and spread.
Where to check current data
- WHO FluNet — global influenza surveillance data
- CDC FluView — weekly US surveillance reports
- UK HSA — national flu and COVID-19 surveillance reports
- Your national or regional public health authority’s seasonal influenza reporting
Regardless of which strain is dominant in a given season, the workplace fundamentals stay the same — see our staying healthy this flu season guide and flu season dates for planning purposes.
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This page provides general guidance on where to find current strain surveillance data and is not medical advice. Always check the linked authorities directly for the most current information.