Swine flu resistance testing to grow after US case (Update)

(AP) -- U.S. health officials are stepping up testing of swine flu cases for Tamiflu resistance, now that an American has come down with a resistant strain.

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<p><a href="http://www.physorg.com/news166211083.html">Swine flu resistance testing to grow after US case (Update)</a></p> <p>(AP) -- U.S. health officials are stepping up testing of swine flu cases for Tamiflu resistance, now that an American has come down with a resistant strain.</p>