There’s a big catch to the HIV prevention pill some are calling ‘100% effective’

A little blue pill called Truvada could effectively prevent people from ever getting HIV — but only if they use it perfectly. A study published this week in Clinical Infectious Diseases followed 657 patients who took Truvada, a prophylactic that protects against HIV, for almost three years. The participants were HIV-negative, but at high risk of contracting the virus.…

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