Ebola vaccine results are encouraging -- but preliminary
On Thursday, results from the World Health Organization's two-year trial studying the Ebola virus were published. They indicate that the vaccine is effective -- but it still needs to be approved by regulatory agencies. Hari Sreenivasan speaks with Dr. Anthony Fauci, director of the NIH's National Institute of Allergy and Infectious Diseases, about promising early results and remaining challenges.
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