ext_2222 ([identity profile] roh-wyn.livejournal.com) wrote in [personal profile] lillbet 2009-07-29 08:18 pm (UTC)

It's standard virus nomenclature for the flu (or influenza A, actually).

Each virus strain gets an H number (for hemaglutinnin) and an N number (for neuraminidase). The numbers just refer to the type of H or N present in a particular virus strain.


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