HIV infections attributed to male-to-male sexual contact - metropolitan statistical areas, United States and Puerto Rico, 2010.

Human immunodeficiency virus (HIV) infections attributed to male-to-male sexual contact comprised 64% of the estimated new HIV infections in the United States in 2009. Assessing the geographic distribution of HIV infection by transmission category can help public health programs target prevention resources to men who have sex with men (MSM) in areas where HIV infection from male-to-male sexual contact is most frequent. In 2004, CDC published data on acquired immunodeficiency syndrome diagnoses among MSM and others by metropolitan statistical area (MSA). To examine geographic differences in the prevalence of HIV infection from male-to-male sexual contact among persons aged ≥13 years in the United States and Puerto Rico, CDC estimated the number of HIV infections in persons newly diagnosed in 2010 and analyzed them by transmission category and location. Results indicated that HIV infections attributed to male-to-male sexual contact made up the largest percentage of HIV infections in MSAs (62.1%), smaller metropolitan areas (56.1%), and nonmetropolitan areas (53.7%). Of the 28,851 infections attributed to male-to-male sexual contact, 23,559 (81.7%) were in MSAs, and 11,410 (48.4%) of those infections were in seven MSAs that represented 31.7% (53,169,004 of 167,919,694) of the overall population aged ≥13 years in the MSAs that were assessed. These data support planning for targeted interventions to prevent HIV acquisition and transmission by male-to-male sexual contact among MSM, particularly in those areas most affected.