(Reuters) - Nearly one in five gay and bisexual men in 21 major U.S. cities are infected with HIV, and nearly half of them do not know it, U.S. health officials said on Thursday.
Young men, and especially young black men, are least likely to know if they are infected with HIV, according to a study by the U.S. Centers for Disease Control and Prevention.
Researchers at the CDC studied 8,153 men who have sex with men in 21 U.S. cities. The men were taking part in the 2008 National HIV Behavioral Surveillance System, which looked at prevalence and awareness of the human immunodeficiency virus or HIV, the virus that causes AIDS.
The study found that 28 percent of gay black men infected with HIV, compared with 18 percent of Hispanic...