What is the ‘super flu’ that is spreading in the United States and Europe?
undefined 6, 2026
The 2024-25 flu season, driven by a new H3N2 variant called subclade K, was the most severe in the US since 2017-18 and hit the UK earlier than any season since 2003-04. Subclade K partially evades immunity but is not more deadly than previous H3N2 strains. Early outbreaks are linked to reduced population immunity post-COVID and heat-related vulnerability. Existing vaccines remain effective at preventing severe illness, and standard measures like vaccination, hand hygiene, masks, and ventilation are recommended.
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