Swine flu origins revealed

A new analysis of the current swine-origin H1N1 influenza A virus suggests that transmission to humans occurred several months before recognition of the existing outbreak.

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<p><a href="http://www.physorg.com/news163944382.html">Swine flu origins revealed</a></p> <p>A new analysis of the current swine-origin H1N1 influenza A virus suggests that transmission to humans occurred several months before recognition of the existing outbreak. </p>