Dr. Ian Crozier stands with a group of survivors and a nurse at the Kenema Government Hospital in Sierra Leone. He contracted Ebola and was on the brink of death, but he survived. Courtesy of WHO/J Amone hide caption

toggle caption Courtesy of WHO/J Amone

The two American Ebola patients are being cared for separately in rooms like this in the special isolation unit, known officially as the Serious Communicable Disease Unit, at Emory University Hospital. Emory University Hospital hide caption

toggle caption Emory University Hospital