Key Facts about Swine Influenza (Swine Flu)

influenza type A H1N1 virus) was first isolated … seasonal flu would not provide protection from H1N1 swine flu viruses. … flu H1N1 viruses are rare. …

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Key Facts about Swine Influenza (Swine Flu)
Over the years, different variations of swine flu viruses have
emerged. At this time, there are four main influenza type A virus subtypes that have been isolated in pigs: H1N1, H1N2, H3N2, and H3N1. However, most of the recently isolated influenza viruses from pigs have
been H1N1 viruses.

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