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GeniusMusing (geniusmusing@nu.federati.net)'s status on Thursday, 08-Feb-2024 00:29:05 JST GeniusMusing
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Types of Influenza Viruses CDC
https://www.cdc.gov/flu/about/viruses/types.htm
>Influenza A viruses are divided into subtypes based on two proteins on the surface of the virus: hemagglutinin (H) and neuraminidase (N). There are 18 different hemagglutinin subtypes and 11 different neuraminidase subtypes (H1 through H18 and N1 through N11, respectively).