Tamiflu-resistant H1N1 cluster reported

Health officials say four people in 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 U.S.

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.

About 52 resistant cases have been reported in the world since April, including 15 in the U.S. so far. Officials with the U.S. Centers for Disease Control and Prevention say almost all the U.S. cases have been isolated.

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Health officials say swine flu cases appear to declining throughout most of the U.S., but the specter of Thanksgiving gatherings next week makes it hard to predict what will happen next.

The Centers for Disease Control and Prevention said Friday that reports of swine flu illnesses were widespread in 43 states last week, down from 46 the week before.

CDC officials also say reports have been increasing in a few states, including Maine and Hawaii. They say it's hard to know whether the epidemic has peaked or not, and many people will be gathering — and spreading germs — next week at Thanksgiving.