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Studies show that a drug called Truvada can prevent HIV infections. The pill is taken once a day. Studies showed it was ninety percent effective when people took it every day. It was only half as effective when people did not take it every day.

Currently, in the United States, the drug is only approved for use as a treatment for people already infected with HIV, the virus that causes AIDS. Now a government advisory committee says Truvada should become the first drug approved for use to prevent HIV.