H1N1, H7N9, H5N1–we hear this “alphanumeric” description of various influenza, or flu viruses all the time.

In this short clip from an older interview, Professor of Microbiology and Immunology at Columbia University and founder of Virology BlogVincent Racaniello, PhD explains more about the Hemagglutinin (HA) and neuraminidase (NA).

flu virus
Generic influenza virion














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