By taking antiretroviral drugs during pregnancy, this Tanzanian mother lowered the risk of passing HIV to her daughter. Siegfried Modola/AFP/Getty Images hide caption

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HIV drugs not only can keep patients healthy but also can stop the sexual transmission of the virus. Here an HIV-positive mother picks up medications at a hospital outside Johannesburg, South Africa. Alexander Joe/AFP/Getty Images hide caption

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United Nations Aids Executive Director Michel Sibide hugs Secretary of State Hillary Clinton after they they presented the a road map for stopping HIV around the world. Jim Watson/AFP/Getty Images hide caption

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A young man places an oral swab into a solution to complete an HIV test during a free screening event in Washington, D.C. Brendan Smialowski/Getty Images hide caption

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Students paste red ribbons on a window to mark World AIDS Day in Nanjing, China, in 2006. Between 2007 and 2011, the number of newly diagnosed HIV cases in China has nearly quadrupled to 40,000. AP hide caption

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The Durban Children's hospital opened in 1931, as a facility for all races, but tensions during the apartheid era forced it to close in the 1980s. Courtesy of KwaZulu-Natal Children's Hospital hide caption

itoggle caption Courtesy of KwaZulu-Natal Children's Hospital

Nurse Irena Majola tests Justice Mlambo's blood for HIV at a roadside AIDS testing table in a suburb near Cape Town. Under the "test and treat" strategy, about 45 million South Africans would need to be screened for HIV each year. Rodger Bosch/AFP/Getty Images hide caption

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A small, plastic vaginal ring loaded up with an HIV drug protects monkeys from infection with simian immunodeficiency virus. Julie Sitney/Courtesy of the Population Council hide caption

itoggle caption Julie Sitney/Courtesy of the Population Council

The pharmacy at Atlanta's Ponce de Leon Center stocks medications for 5,200 HIV/AIDS patients. Workers there aren't sure how much an increase in federal aid will help cut Georgia's waiting list for a HIV drug-assistance program. Jim Burress/WABE, Atlanta hide caption

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Ruben Bermudez stands in front of a sign that says in Spanish, "To love yourself is to protect yourself." He has struggled to remain eligible for AIDS drug assistance programs since he went on treatment four years ago. Jessica Camille Aguirre/NPR hide caption

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"You've been condomized!" said Joy Lynn Alegarbes, of The Condom Project, which promoted safe sex at the 19th International AIDS Conference. The group handed out more than 850,000 condoms this week. Benjamin Morris/NPR hide caption

itoggle caption Benjamin Morris/NPR

Dr. Lisa Sterman holds Truvada pills at her office in San Francisco. The drug was recently approved by the Food and Drug Administration to prevent infection in people at high risk of infection with HIV. The pill, already used to treat people with HIV, also helps reduce the odds they will spread the virus. Jeff Chiu/AP hide caption

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