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President Barack Obama listens as Dr. Nancy Sullivan, Senior Investigator; Chief, Biodefense Research Section, National Institute of Allergy and Infectious Diseases, during a NIH tour of the Vaccine Research Center at the National Institutes of Health (NIH), Tuesday, Dec. 2, 2014, in Bethesda, Md. (AP Photo/Pablo Martinez Monsivais)
Photo by: Pablo Martinez Monsivais
President Barack Obama listens as Dr. Nancy Sullivan, Senior Investigator; Chief, Biodefense Research Section, National Institute of Allergy and Infectious Diseases, during a NIH tour of the Vaccine Research Center at the National Institutes of Health (NIH), Tuesday, Dec. 2, 2014, in Bethesda, Md. (AP Photo/Pablo Martinez Monsivais)

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