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From where did the 2009 'swine-origin' influenza A virus (H1N1) emerge?

24 Nov 2009

Abstract excerpt

The swine-origin influenza A (H1N1) virus that appeared in 2009 and was first found in human beings in Mexico, is a reassortant with at least three parents. Six of the genes are closest in sequence to those of H1N2 'triple-reassortant' influenza viruses isolated from pigs in North America around 1999-2000. Its other two genes are from different Eurasian 'avian-like' viruses of pigs; the NA gene is closest to H1N1...

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PMID: 19930669
DOI: 10.1186/1743-422x-6-207

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