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The 18th International AIDS Conference was in beautiful (but hot) Vienna, Austria, and for the first time ever, HIV prevention truly took center stage. The biggest news by far was the CAPRISA 004 study (see JW AIDS Clin Care Jul 26 2010), which was presented in detail on the same day the results were published in Science. By demonstrating the efficacy of a tenofovir microbicide gel in preventing HIV infection, investigators gave us the first-ever clearly positive microbicide study, thus ending years of disappointing research. Almost as interesting as the results was the rapturous response of the assembled audience, with spontaneous cheers erupting as results were presented, and a standing ovation taking place at the end. A colleague of mine…