President Obama greets Dr. Nancy Sullivan, a cell biologist with the National Institutes of Health's Vaccine Research Center

President Barack Obama greets Dr. Nancy Sullivan, a cell biologist with the National Institutes of Health's Vaccine Research Center, following his remarks on the progress made to date and the next steps in our response to the Ebola outbreak in West Africa, in the Eisenhower Executive Office Building South Court Auditorium, Feb. 11, 2015.