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Methamphetamine use increases the likelihood of high-risk sexual behavior among men who have sex with men (MSM), but the relation between methamphetamine use and HIV incidence has not been well studied. To evaluate this association, investigators conducted a prospective analysis among 4003 MSM who were HIV-negative when they enrolled in the Multicenter AIDS Cohort Study (MACS). The men completed detailed interviews and underwent HIV testing every 6 months.
During the study, 436 MSM became HIV-positive, and 3567 remained HIV-negative. Seroconverters were more likely than those who remained uninfected to report unprotected insertive or receptive anal intercourse at baseline and to report use of methamphetamine, poppers, cocaine, or ecstasy at …