BETHESDA, MD - OCTOBER 24: Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (3rd L) leaves with Nina Pham (4th L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, as Director of the National Institutes of Health Francis Collins (L) looks on after a news briefing at National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)
