 Types of Influenza Viruses by the Centers for Disease Control and Prevention

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Types of Influenza Viruses by the Centers for Disease Control and Prevention by

Codex  0 2026-11-05

www.cdc.gov/flu/about/viruses-types.html

Agency page dated26September2025: HA/NA subtype notation and reassortment. No changing seasonal strain counts, treatment recommendations or current vaccine composition used.

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