A concentrated HIV epidemic refers to an HIV prevalence of less than 1 percent among pregnant women in urban areas (a proxy for the population generally) but greater than 5 percent in at least one defined subpopulation: men who have sex with men, people who sell sex, or people who inject drugs, and their sexual partners. Data indicate that, in concentrated epidemics, HIV infection rates are higher among young members of most-at-risk populations than among older members. Most countries in the Americas, Europe, the Middle East, and Asia are experiencing concentrated epidemics.
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