Several countries, including Australia, Japan and Great Britain, already encourage blood donations from some gay men. Kevin Curtis/Getty Images/Science Photo Library hide caption

itoggle caption Kevin Curtis/Getty Images/Science Photo Library

South Africa Health Minister Aaron Motsoaledi has no patience for people who abuse their health and expect the government to fix things. Alexander Joe/AFP/Getty Images hide caption

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Do you know what the deadliest disease is? Hint: It's not Ebola (viral particles seen here in a digitally colorized microscopic image, at top right, along with similar depictions of other contagious diseases) NPR Composite/CDC hide caption

itoggle caption NPR Composite/CDC

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

itoggle caption Leon Neal/AFP/Getty Images

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

itoggle caption Anna Zieminski/AFP/Getty Images

Better than Egyptian cotton: This electrically spun fabric contains anti-HIV drugs and dissolves rapidly when it gets wet. Courtesy of University of Washington hide caption

itoggle caption Courtesy of University of Washington

Truvada, an FDA-approved drug to help prevent HIV infection, is among the AIDS drugs that fill pharmacy shelves at the Whitman-Walker clinic, a Washington, D.C., community health center. Astrid Riecken/MCT/Landov hide caption

itoggle caption Astrid Riecken/MCT/Landov

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

itoggle caption Jean Ayissi/AFP/Getty Images

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

itoggle caption Astrid Riecken/MCT/Landov

Human immunodeficiency virus Type 1 inserts its genetic material into the DNA of human cells, turning them into little HIV factories. Eye of Science/Science Source hide caption

itoggle caption Eye of Science/Science Source

HIV particles (red) invade a human immune cell. When HIV is transmitted through sex, only the strongest versions of the virus establish long-term infection. Chris Bjornberg/ScienceSource hide caption

itoggle caption Chris Bjornberg/ScienceSource

HIV/AIDS drugs like AZT are lifesavers for many people. But insurers' policies on paying for the drugs vary widely. Will & Deni McIntyre/Science Source hide caption

itoggle caption Will & Deni McIntyre/Science Source

The mask of this Kiev protester (at a 2012 demonstration demanding more funding for HIV treatment) reads "quarantine." There are enough drugs to treat only half the HIV patients in Ukraine. Sergei Supinsky/AFP/Getty Images hide caption

itoggle caption Sergei Supinsky/AFP/Getty Images