World AIDS Day 2011: A Year in the Global Pandemic

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Researchers Discover Early Use of Antiretroviral Drugs May Curb Spread of HIV/AIDS

Data released this year from studies conducted in several African countries showed that couples who were assigned to take the antiviral drug, tenofovir, had 62 percent fewer infections than couples who had taken a placebo; couples assigned to take Truvada (another antiviral drug) had 73 percent fewer infections.

(Photo: Justin Sullivan/Getty Images)

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