For HIV-negative men who have sex with men, taking preemptive antiretrovirals seems to reduce the risk of getting infected by about 44 percent, according to a new international study. Among those who reported having unprotected receptive anal sex, the prophylactic drug treatment was about 58 percent effective in preventing infection, and among all study subjects who took the recommended daily dose at least 90 percent of the time, the treatment had about a 73 percent efficacy in preventing transmission. [More]













Scientific American - News