By BETSY MCKAY And AMY DOCKSER MARCUS
A study released Tuesday shows an existing antiretroviral drug can also ward off HIV infections in what researchers call a major advance in the quest to find medicines that prevent rather than simply treat AIDS.
The study of nearly 2,500 gay and bisexual men on four continents follows two other recent breakthroughs in AIDS-prevention research after years of frustration and as the cost of treating HIV/AIDS globally continues to rise, with about 2.7 million new HIV infections every year.
In the latest study, published online in the New England Journal of Medicine, gay and bisexual men who took the drug in pill form were 44% less likely to become infected than a control group taking a placebo.
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