The first patient to be diagnosed with Ebola in the U.S. died from the disease Wednesday, renewing concerns that his chance of survival might have been affected by a Dallas hospital's initial decision not to admit him for care. “It's hard to say why one patient survives and another doesn't and how much good supportive care can do,” said Dr. A. Scott Lea, a UTMB professor of internal medicine. “If Duncan had a viral overload, probably nothing was going to save him.”