An illustration of rinderpest in the Netherlands in the 18th century. Europeans once feared the cattle virus as much as they did the Black Death. Jacobus Eussen/Wikimedia Commons hide caption

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The bacterium that causes syphilis is spread through sexual contact. It's easily cured with antibiotics, but can be hard to diagnose. CDC/Phanie/Science Source hide caption

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Chris Nickels for NPR

None of the biocontainment treatment centers in U.S. hospitals were specifically designed for kids — until now. Texas Children's Hospital aims to fill that gap. Courtesy of Texas Children's Hospital hide caption

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Scientists think the lone star tick (center) likely transmits Heartland disease to people. And the virus probably also circulates in deer and coyotes. iStockphoto; CDC; iStockphoto hide caption

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Officials cut off water to San Quentin State Prison in California to squelch an outbreak of Legionnaires' disease. Robert Galbraith/Reuters/Landov hide caption

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A celebration erupts in the streets of the Massessehbeh village on Friday, after President Ernest Bai Koroma officially ended Sierra Leone's largest remaining Ebola quarantine. Sunday Alamba/AP hide caption

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