
DURHAM, NC (AP)--Health officials say that three of four patients who had tested positive for a Tamiflu-resistant type of swine flu died at the Duke University Medical Center in North Carolina.
The cases, reported over a period of six weeks, make up the largest number of cases seen in one place so far in the U.S.
Tamiflu is one of two flu medicines used to protect against swine flu, and health experts have been keeping a watchful eye for any sign that the virus is mutating and becoming resistant to the drug.
More than 50 resistant cases have been reported in the world since April, including 21 in the U.S.
Almost all the cases in the U.S. were isolated, said officials with the U.S. Centers for Disease Control and Prevention.




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