An American missionary doctor working in Liberia has tested positive for the deadly Ebola virus.
The director of the Center for Disease Control told CNN the Ebola outbreak is "spiraling out of control," just before briefing President Obama on the crisis Tuesday.
Human trial of experimental Ebola vaccine begins this week
Meanwhile, tests began Tuesday of an experimental vaccine to fight the epidemic.
OutFront, the Director of the National Institute of Allergy and Infectious diseases, Doctor Anthony Fauci.
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