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Health care workers in South Africa speak to residents during a door-to-door AIDS awareness campaign, part of a series of prevention efforts that has helped lower the country's HIV infection rate.
Mujahid Safodien /Reuters /Landov
July 25, 2012 More than half a million South Africans were infected with HIV in 2000. Efforts to stem the virus since then have produced marked results in the number of new infections. But the total number of people with HIV in South Africa still isn't going down.
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