Experts: Mild swine flu could quickly turn deadly

(AP) -- A flu virus is a powerhouse of evolution, mutating at the maximum speed nature allows. A mild virus can morph into a killer and vice versa.

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<p><a href="http://www.physorg.com/news160765874.html">Experts: Mild swine flu could quickly turn deadly</a></p> <p>(AP) -- A flu virus is a powerhouse of evolution, mutating at the maximum speed nature allows. A mild virus can morph into a killer and vice versa.</p>