Trying a Pill to Prevent HIV

In a massive medical trial on three continents, doctors are testing a controversial pill that could temporarily boost immunity against HIV before a person is even exposed to the virus. If the pill works safely, doctors must then address whether such a drug, if made widely available, could actually worsen the AIDS epidemic. The pre-exposure pill undergoing testing seems promising, since HIV drugs taken within days after exposure to the virus have been shown to reduce the risk of infection by 80...Full Story
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