"One in five sexually active gay and bisexual men has HIV, and nearly half of those don't know they are infected, a federal study of 21 U.S. cities shows. Experts said the findings are similar to earlier research, but the study released Thursday is the largest to look at gay and bisexual U.S. men at high risk for HIV. More than 8,000 men were tested and interviewed, and 44% of those who had the virus didn't know they had it."
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