Thu Nov 12, 11:18 PM ET

A young woman gets an H1N1 flu vaccine at Delaney Sisters Medical Center on November 11, in New York. Swine flu is thought to have killed nearly 4,000 people, including 540 children, in the United States since it emerged in April, officials said Thursday citing a new model for counting A(H1N1) fatalities. (AFP/File/Don Emmert)

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