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A billboard promoting safe sex and condom use in Gaborone, Botswana. Botswana has one of the highest HIV/AIDS infection rates in the world, with about 38.5 percent of the adult population infected. Botswana is the first country to provide antiretroviral therapy on a national scale to its citizens through a program called MASA, meaning new dawn in Setswana. (Photo by Jonathan Kingston/Aurora)