The two American Ebola patients, medical missionaries Nancy Writebol and Dr. Kent Brantly, have walked out of Emory University Hospital in Atlanta infection-free. They were the first human beings to receive an experimental drug called ZMapp. But they are not the first people to have recovered from Ebola, and good hospital care is likely more responsible for their recovery than any mysterious “serum," as the charities they work for termed it. “They are the very first individuals to have ever receive this agent,” Dr. Bruce Ribner, director of Emory’s Infectious Disease Unit, told a news conference. “There is no prior...