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It’s the second big advance in less than a year on the prevention front. Last fall, scientists reported that an experimental vaccine cut the risk of HIV infection by about 30 percent. Research is under way to try to improve it.
If further study shows the gel to be safe and effective, WHO will work to speed access to it, said its director-general, Dr. Margaret Chan.
The gel is in limited supply; it’s not a commercial product, and was made for this and another ongoing study from drug donated by California-based Gilead Sciences Inc., which sells tenofovir in pill form as Viread. If further study proves the gel effective, a full-scale production system would need to be geared up to make it.
The study tested the gel in 889 heterosexual women in and near Durban, South Africa. Researchers had no information on the women’s partners, but the women were heterosexual and, in general, not in a high-risk group, such as prostitutes.

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