Swine flu could become pandemic, health officials say

A growing number of swine flu cases in Mexico and the U.S. has international health officials concerned that the aggressive virus could infect people worldwide.

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<p><a href="http://www.physorg.com/news159968252.html">Swine flu could become pandemic, health officials say</a></p> <p> A growing number of swine flu cases in Mexico and the U.S. has international health officials concerned that the aggressive virus could infect people worldwide.</p>