There’s good news in the fight against HIV. A new South African study has found that a microbicide gel containing the antiretroviral medication, Tenofovir can significantly reduce the rate of HIV infections. The study included almost 900 volunteers and showed that the gel cut a woman’s chances of being infected by 50 percent after the first year.

Broader trials are still needed to confirm the results. For more, we talk with Naomi Rutenberg, vice president and director of the HIV and AIDS program at the Population Council.