Patient Nina Pham is hugged by Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, outside of the National Institutes of Health in Bethesda, Md., on Friday. Pham was discharged after testing free of Ebola. Pablo Martinez Monsivais/AP hide caption

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Peter Piot was one of the co-discoverers of the Ebola virus in 1976. "I never thought we would see such a devastating and vast epidemic," he says. Leon Neal/AFP/Getty Images hide caption

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Over a decade ago, rumors spread in South Africa that sex with a virgin could cure HIV/AIDS. In 2001, 150 people gathered in Cape Town to protest the rape of children and even babies, allegedly as a result of belief in this canard. Anna Zieminski/AFP/Getty Images hide caption

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Truvada has been around for a decade as a treatment for people who are already HIV-positive. In the last few years, it has also been shown to prevent new infections, and New York officials are embracing the pill as a way to prevent the spread of AIDS. Justin Sullivan/Getty Images hide caption

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Joep Lange led many early drug trials of HIV therapies and studied how to prevent HIV-positive pregnant women from transmitting the virus to their babies. Jean Ayissi/AFP/Getty Images hide caption

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At a July 18 press conference at Amsterdam's Schiphol Airport, Vice President of Malaysia Airlines Europe Huib Gorter talk about the crash of flight MH17. Christopher Furlong/Getty Images hide caption

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AIDS drugs line a pharmacy's shelves. A new recommendation from the World Health Organization suggests a daily anti-HIV pill for men who have sex with men. Astrid Riecken/MCT/Landov 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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Young activists distribute condoms at an AIDS awareness event in Ashbury Park, N.J. Charles Sykes/AP hide caption

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HIV treatment regimens, like the pills in this patient's hand, keep AIDS at bay, but can take a harsh physical toll over the course of many years. Amy Sancetta/AP hide caption

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