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PrEP, the FDA-approved HIV prevention medication, has become an increasingly popular safeguard among gay and bisexual men; however the pill is not without controversy. CNN's Sanjay Gupta reports.

A look at PrEP, a prevention strategy for people at high risk for contracting HIV. Researchers at the University of California explain how pre-exposure prophylaxis (PrEP) works as they describe a four-year, multi-pronged study of men who have sex with men in Los Angeles and San Diego. Participants a...

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