President Obama greets Ebola survivor Dr. Melvin Korkor after delivering remarks at the Global Health Security Agenda Summit, Sept. 25, 2014

President Barack Obama greets Ebola survivor Dr. Melvin Korkor, of Liberia, after delivering remarks at the Global Health Security Agenda Summit in the Eisenhower Executive Office Building South Court Auditorium, Sept. 25, 2014. Health and Human Services Secretary Sylvia Mathews Burwell, right.