WASHINGTON, DC - OCTOBER 24: U.S. President Barack Obama gives a hug to Dallas nurse Nina Pham in the Oval Office of the White House October 24, 2014 in Washington, DC. Pham, a nurse who was infected with Ebola from treating patient Thomas Eric Duncan at Texas Health Presbyterian Hospital in Dallas and was first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Olivier Douliery-Pool/Getty Images)