ADVANCE FOR USE SUNDAY, SEPT. 20, 2015 AT 9 P.M. EDT (0100 GMT) AND THEREAFTER - FILE - In this Sunday, Aug. 10, 2014 file photo, a ward at the government hospital in Kenema, eastern Sierra Leone lies empty after patients left and others were scared to be admitted, fearing they would contract the Ebola virus. More than 40 health workers at the facility have died from the virus. An Associated Press investigation has found a toxic mix of avoidable problems faced by Ebola responders, including weak leadership, shoddy supplies and infighting, exacerbated a chaotic situation at a critical front in the battle against the virus. (AP Photo/Michael Duff, File)