Proteins and enzymes that will produce antibodies for the experimental Ebola drug ZMapp are developed on the leaves of the nicotiana benthamiana plant, a relative of tobacco. Here, indicator proteins glow under ultraviolet light — a way to assess the success of bacteria spread. Sean Gallup/Getty Images hide caption

itoggle caption Sean Gallup/Getty Images

Dr. Kent Brantly (center) announces his recovery from Ebola, with his wife, Amber Brantly (left), during a press conference at Emory University Hospital Thursday in Atlanta. Brantly got sick at the end of July. Jessica McGowan/Getty Images hide caption

itoggle caption Jessica McGowan/Getty Images

Miguel Pajares, a Spanish priest who was infected with the Ebola virus while working in Liberia, is transferred from a plane to an ambulance after arriving in Spain. He was treated with an experimental drug but died on the disease. Spanish Defense Ministry/AP hide caption

itoggle caption Spanish Defense Ministry/AP