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Four main virus subtypes - H1N1, H1N2, H3N2 and H3N1 - have been isolated in pigs, though the virus, like all influenza viruses, constantly mutates. When influenza viruses from different species infect pigs, the viruses can trade genes to create new versions that mix swine, human and/or avian influenza.The swine H1N1 virus is not the same as the human H1N1 virus, so vaccines for the latter won't protect from the former.

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