HIV drugs may prevent infection in high-risk men

HIV drugs may prevent infection in high-risk men: "Researchers in South Africa and elsewhere are investigating whether taking AIDS drugs daily can prevent HIV infection among high-risk gay and bisexual men, in the latest effort to combat the epidemic.In a study launched on Tuesday, researchers want to find out whether antiretroviral drugs normally used by people already infected with HIV can protect those at high risk of infection, a concept referred to as pre-exposure prophylaxis (PrEP)."