MMWR: Prevalence and Awareness of HIV Infection Among Men Who Have Sex With Men—21 Cities, United States, 2008

Men who have sex with men (MSM) are at increased risk for infection with human immunodeficiency virus (HIV). In 2006, 57% of new HIV infections in the United States occurred among MSM (1). To estimate and monitor risk behaviors, CDC's National HIV Behavioral Surveillance system (NHBS) collects data from metropolitan statistical areas (MSAs) using an anonymous cross-sectional interview of men at venues where MSM congregate, such as bars, clubs, and social organizations.

Source: http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5937a2.htm?s_cid=mm5937a2_w

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