i think one of the links did say that it originated in pigs or something along those lines but contains strains of all three.
i googled:
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Quote:
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Schuchat said Thursday that the virus in the United States is influenza A N1H1 mixed with swine influenza viruses. The virus contains genetic pieces from four different flu viruses -- North American swine influenza, North American avian influenza, human influenza viruses and swine influenza viruses found in Asia and Europe, she said.
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http://www.forbes.com/feeds/hscout/2...out626461.html