FILE - This handout file photo taken Sept. 2, 2014, provided by National Institute of Allergy and Infectious Diseases (NIAID) shows a 39-year-old woman, the first participant enrolled in VRC 207, receiving a dose of the investigational NIAID/GSK Ebola vaccine at the National Institute of Health (NIH) Clinical Center in Bethesda, Md. The hope is that the first human safety study of the vaccine might eventually be used in the current Ebola outbreak in West Africa. New monkey studies show that one shot of an experimental Ebola vaccine can trigger fast protection, but the effect waned unless the animals got a booster shot made a different way. (AP Photo/NIAID, File)