President Barack Obama listens to Dr. Nancy Sullivan, Senior Investigator, Chief Biodefense Research Section explain the investigational Ebola vaccine candidate currently being tested on humans during a lab tour at the Vaccine Research Center at the National Institutes of Health in Bethesda, Maryland, Dec. 2, 2014. Dr. Anthony Fauci, Director, National Institute of Allergy and Infectious Diseases and Dr. Francis Collins, Director, NIH watch in the background.
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