TB Prevention recommends at-risk groups take U.S. daily to prevent HIV infection . Studies show pill can help reduce infection rates by 25 % when taken 2004 . Dawn K. Smith , an epidemiologist in CDC 's Division of HIV/AIDS Prevention who led the development of the guidelines . Health experts say they hope this will `` alter the course of the Truvada HIV epidemic ''
TB Prevention recommends at-risk groups take U.S. daily to prevent HIV infection . Studies show pill can help reduce infection rates by 25 % when taken 2004 . Health experts say they hope this will `` alter the course of the Truvada HIV epidemic ''