Ebola survivor Kent Brantly received an experimental drug called ZMapp, made using tobacco plants by Kentucky BioProcessing in Owensboro, which is contracted by drugmaker Mapp Biopharmaceutical of San Diego. He was also given plasma from a 14-year-old Ebola survivor he treated. He was flown to Emory, where he received supportive care and recovered. Since then, Brantly has donated his own plasma to Dallas nurses Nina Pham and Amber Vinson, who had contracted Ebola and have now recovered. Thomas Geisbert, a professor of microbiology and immunology at UTMB working on Ebola therapies, said plasma from Ebola survivors is not a proven remedy, and it's unclear how much of a role it has played in the U.S. Ebola recoveries. "The jury is out (on plasma)," Geisbert said, because all of the American patients and some in Europe "were also treated with other things." Still, Geisbert said he's heartened that Brantly donated to others; "I think what he's doing is awesome."