A woman is injected by a health care worker, left, as she takes part in an Ebola virus vaccine trial, at one of the largest hospital's Redemption hospital in Monrovia, Liberia, Monday, Feb. 2, 2015. A large-scale human trial of two potential Ebola vaccines got under way in Liberia's capital Monday, part of a global effort to prevent a repeat of the epidemic that has now claimed nearly 9,000 lives in West Africa. (AP Photo/Abbas Dulleh)
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