This article originally appeared on MD Magazine.

In what could be among the most promising development in AIDS care since protease inhibitors, David Ho, MD, opened the United States Conference on AIDS this morning with news of a promising pre-exposure prophylactic, a PreP antiviral that could be given as an injection every eight weeks.

Ho, head of the Aaron Diamond AIDS Research Center in Manhattan and a professor at Rockefeller University, was the keynote speaker at the conference, held in Hollywood, FL.

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