Nina Pham, 26, steps off a plane Thursday night at a municipal airport in Frederick, Md. An ambulance was waiting to take her to the National Institutes of Health in Bethesda, Md. Paul J. Richards/AFP/Getty Images hide caption

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Ebola has spread through Monrovia, Liberia's congested capital city. John Moore/Getty Images hide caption

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The Changing Face Of West Africa Has Fueled The Ebola Crisis

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