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New HIV drug gives hope for prevention
USA Today

A major study shows for the first time that a drug duo widely used to treat the AIDS virus can block HIV infection, researchers said today. The drugs tenofovir and emtricitabine, packaged as a once-daily pill and sold in drugstores as Truvada, reduced HIV infections by an average of 44% among gay and bisexual men who took the drug, compared with those taking a placebo. Men who reported being the most diligent about taking their pill each day reaped an even bigger benefit, reducing their risk by 73%.