Extrapolating from sequence—the 2009 H1N1 'swine' influenza virus

The recent incidence and spread in humans of the 'swine flu' influenza A virus has raised global concerns regarding its virulence and pandemic potential. The main cause of the so-called swine flu has been identified as human infection by influenza A viruses of a new H1N1 (hemagglutinin 1, neuraminidase 1) subtype, or '2009 H1N1 strain'.

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