CDC: 250,000 Americans Don't Know They're HIV-Positive

Some 250,000 Americans are HIV positive but unaware of it, according to a Centers for Disease Control and Prevention study released Thursday, and most of them are not in high-risk groups.

"In the past, people associated HIV with drug use and men who have sex with men," said Bernard Branson, associate director for Laboratory Diagnostics in CDC's division of HIV/AIDS prevention. "But the epidemic is changing, and there is an increased proportion of cases that have been reported in heterosexual transmissions and among women," he said.

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