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SAN ANSELMO, CA - NOVEMBER 23:  Antiretroviral pills Truvada sit on a tray at Jack's Pharmacy on November 23, 2010 in San Anselmo, California. A study published by the New England Journal of Medicine showed that men who took the daily antiretroviral pill Truvada significantly reduced their risk of contracting HIV.  (Photo Illustration by Justin Sullivan/Getty Images) Justin Sullivan / Getty Images