Swine flu goes person-to-pig; could it jump back?

(AP) -- Now that the swine flu virus has passed from a farmworker to pigs, could it jump back to people? The question is important, because crossing species again could make it more deadly.

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<p><a href="http://www.physorg.com/news160636697.html">Swine flu goes person-to-pig; could it jump back?</a></p> <p>(AP) -- Now that the swine flu virus has passed from a farmworker to pigs, could it jump back to people? The question is important, because crossing species again could make it more deadly.</p>