Health officials say four people in the state of North Carolina have tested positive for a type of swine flu that's resistant to the drug Tamiflu. It's the first cluster of that many cases seen in the US.
Health officials said Friday the four cases were reported at Duke University Medical Center in Durham over the past six weeks. Tamiflu is one of two medicines that help against swine flu. Health officials have been closely watching for signs that the virus is mutating, making the drugs ineffective. (AP)
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