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Associated Press
FILE - In this March 7, 2015 file photo, a health worker, right, cleans a man's arm before injecting him with a Ebola vaccine  in Conakry, Guinea. An experimental vaccine tested on thousands of people in Guinea exposed to Ebola seems to work and might help shut down the ongoing epidemic in West Africa, according to interim results from a study published Friday, July 31, 2015. There is currently no licensed treatment or vaccine for Ebola, which has so far killed more than 11,000 people in West Africa since the world’s biggest outbreak began last year.  (AP Photo/ Youssouf Bah, File)

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