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Why An Imperfect HIV Vaccine Could Be Better Than None At All

An experimental vaccine against the AIDS virus is being tested in South Africa. Scientists hope it will succeed where others have failed. (Mujahid Safodien/AFP/Getty Images)
An experimental vaccine against the AIDS virus is being tested in South Africa. Scientists hope it will succeed where others have failed. (Mujahid Safodien/AFP/Getty Images)

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