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But this kind of focus has become ineffective because “increasing proportions of infected people” are women, teenagers, minority populations, people who live outside metropolitan areas, and “heterosexual men and women who frequently are unaware that they are at risk for HIV,” the CDC said.

Moreover, studies found that the costs of routinely testing most U.S. teens and adults would be offset by identifying and treating new infections. People who use antiretroviral drugs, especially soon after being infected, are less likely to transmit HIV.