WASHINGTON, DC - SEPTEMBER 16:  Ebola survivor Dr. Kent Brantly testifies before the Senate Health, Education, Labor and Pensions Committee  on 'Ebola in West Africa: A Global Challenge and Public Health Threat' September 16, 2014 in Washington, DC. Brantly contracted Ebola while working as the medical director for Samaritan's Purse Ebola Care Center in Monrovia, Liberia. He was also the first person to be treated with the experimental drug ZMapp nine days after falling ill.  (Photo by Chip Somodevilla/Getty Images)