The Angolan military administers yellow fever vaccines at a market in Luanda, the capital city. Joost De Raeymaeker/EPA/Corbis hide caption

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A 'Forgotten Disease' Is Suddenly Causing New Worries

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Mmm. Smells just like your identical twin. iStockphoto hide caption

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Why Do Mosquitoes Like To Bite You Best? It's In Your Genes

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In this colored transmission electron micrograph, an infected cell (reddish brown) releases a single Ebola virus (the blue hook). As it exits, the virus takes along part of the host cell's membrane (pink, center), too. That deters the host's immune defenses from recognizing the virus as foreign. London School of Hygiene & Tropical Medicine/Science Source hide caption

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Ebola Drug Could Be Ready For Human Testing Next Year

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