ADVANCE FOR USE SUNDAY, SEPT. 20, 2015 AT 9 P.M. EDT (0100 GMT) AND THEREAFTER - FILE - In this Wednesday, Sept. 24, 2014 file photo, a health worker sprays a colleague with disinfectant after working inside a morgue with people suspected of dying from the Ebola virus, in Kenema, eastern Sierra Leone. An Associated Press investigation has found that the World Health Organization and other responders faced key obstacles in their efforts to stop the spiraling Ebola outbreak in the summer of 2014 in Kenema, a pivotal seeding point for the virus and a microcosm of the messy response across West Africa. (AP Photo/Tanya Bindra, File)
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