Photo taken on March 11, 2014 shows David Henderson, deputy cheif of the clinic research center of the National Institutes of Health (NIH), introducing a room in Bethesda, Maryland, the United States. Texas Health Presbyterian Hospital nurse Nina Pham was transferred from Dallas to an isolation unit at the NIH on Oct. 16, 2014. Pham contracted Ebola when she was part of a team of healthcare workers who had treated Thomas Eric Duncan, the Liberian who was the first patient diagnosed with the virus in the US. (Xinhua/Bao Dandan)