Liberia Races To Expand Ebola Treatment Facilities, As U.S. Troops Arrive [Getty Images]

GBARNGA, LIBERIA - OCTOBER 07: U.S. Navy microbiologist Lt. Jimmy Regeimbal handles a vaccine box with blood samples while testing for Ebola at the U.S. Navy mobile laboratory on October 5, 2014 near Gbarnga, Liberia. The U.S. now operates 4 mobile laboratories as part of the American response to the Ebola epidemic. The disease has killed more than 3,400 people in West Africa, according to the World Health Organization. (Photo by John Moore/Getty Images)

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