Gilead's Viread Reduces HIV Risk for Drug Users by 49% in Study

... 2001 to 2011, defying a global downturn in the virus's spread, according to the Joint United Nations Program on HIV/AIDS, or UNAIDS. Previous studies have shown PrEP can help reduce the risk of HIV infection by 44 percent in gay and bisexual men, ...

http://washpost.bloomberg.com/Story?docId=1376-MOAGE46K50XU01-1O55S91D63OOET87BPTOHNUM13