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Flu season surveillance

Global and national surveillance show Influenza A predominating this season, with A(H3N2) variants increasing rapidly since late summer.

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Jan 22, 2026
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Which influenza A subtypes were most prevalent in the 2024-2025 season globally and by region?

Global surveillance for the points to a complex picture: influenza A viruses dominated overall, but the prevailing A subtype varied by place and time, with rising globally in later reports while had d...