Associated Press
This photo provided by Gilead Sciences shows Truvada.  A panel of federal health advisers votes today, Thursday, May 10, 2012, on whether to endorse the first drug shown to prevent HIV infection, potentially clearing the way for a landmark approval in the 30-year effort against the virus that causes AIDS. The Food and Drug Administration advisers will vote on whether Truvada should be approved as a preventative treatment for people who are at high risk of contracting HIV, such as gay and bisexual men. (AP Photo/Gilead Sciences)

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