A boy watches as a U.S. Marine MV-22 Osprey tiltrotor departs the site of an Ebola treatment center under construction on October 15, 2014 in Tubmanburg, Liberia. The center is the first of 17 Ebola treatment centers being built by Liberian forces under American supervision as part of Operation United Assistance to combat the Ebola epidemic. (Photo by John Moore/Getty Images)
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