ATLANTA -- U.S. health officials are stepping up testing of swine flu cases for Tamiflu resistance.
The action comes after an American teen was diagnosed with a resistant strain. The San Francisco teenager was diagnosed with swine flu last month after arriving in Hong Kong, and has since recovered.
Officials on Tuesday confirmed the 16-year-old lived in San Francisco and likely was infected in the United States.
She's just the third person in the world known to have a strain resistant to Tamiflu, the main weapon against swine flu.
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