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In the U.K., more than 3000 men who have sex with men (MSM) received a new diagnosis of HIV infection in 2010 — the highest number since the start of the HIV epidemic. Using a computer model of HIV transmission, investigators analyzed the relative influence of changes in sexual risk behavior, HIV testing rates, and antiretroviral therapy (ART)-induced virologic suppression on HIV incidence in this population between 1980 and 2010.
HIV incidence was high in the early 1980s and then fell in response to a decline in sexual risk behavior (i.e., condomless anal sex with a partner of unknown or negative HIV status within the preceding year). According to the model, the proportion of MSM who engaged in sexual risk behavior following the introductio…