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Efforts to further decrease new HIV infections in the U.S. require an understanding of demographic and other factors that increase risk. In 2010, 63% of new infections occurred in men who have sex with men (MSM), of whom 36% were black and 30% were aged 13 to 24. Young black MSM were particularly at risk — 45% of the newly infected black MSM were in this age group.
To investigate risk factors associated with HIV acquisition in young MSM, researchers conducted a prospective cohort study involving 18- and 19-year-old MSM living in the New York City area. Participants were assessed for HIV status and risk behaviors at baseline and every 6 months thereafter for 3 years. Forty-three (7.2%) of the 594 participants seroconverted during the study pe…