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Novel H1N1 influenza in people: global spread from an animal source?

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Origins and evolutionary genomics of the 2009 swine-origin H1N1 influenza A epidemic

(2009) Gavin J. D. Smith et al.   NATURE

Triple-Reassortant Swine Influenza A (H1) in Humans in the United States, 2005–2009

(2009) Vivek Shinde et al.   NEW ENGLAND JOURNAL OF MEDICINE

New Details on Virus's Promiscuous Past

(2009) J. Cohen   SCIENCE

Novel reassortant of swine influenza H1N2 virus in Germany

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