Vaccine

Influenza

There are 3 types of influenza viruses – A, B and C.

Type A influenza viruses are further classified into subtypes according to the combinations of various virus surface proteins. Among many subtypes of influenza A viruses, influenza A(H1N1) and A(H3N2) subtypes are currently circulating among humans. Influenza viruses circulate in all parts of the world.

Type C influenza cases occur much less frequently than A and B.

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