Swine flu worse in Mexico than US, but why?

(AP) -- Why has the swine flu engulfing Mexico been deadly there, but not in the United States?

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<p><a href="http://www.physorg.com/news159946708.html">Swine flu worse in Mexico than US, but why?</a></p> <p>(AP) -- Why has the swine flu engulfing Mexico been deadly there, but not in the United States?</p>