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. Read more »
New guidelines by the American College of Obstetricians and Gynecologists say most women in their 20s can have a Pap smear every two years instead of annually to catch slow-growing cervical cancer.
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The U.S. Marine Corps is conducting a military experiment to try to predict who's most at risk for post-traumatic stress disorder. Understanding underlying triggers might help reduce the burden of those who return psychologically wounded - if they can get early help.
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