This guy probably knew he had ebola and didn't speak up to the nurses enough the first time he went to the hospital. If you read about his time in Liberia he was caring directly for people who had and were dying of ebola. His buddy. His buddy's pregnant sister. He tried to carry her to a nearby hospital and they denied her for lack of space. She died the next day. Couple of days later, he flew to the US. If I were a betting man he came here knowing he might have a chance to get the virus(he said he was just visiting) and he would have access to better care. Why he only told the nurses that he came from Western Africa(what the hell nurse can't you put two and two together) and didn't straight up say I probably have ebola the first time he went to the hospital, god knows.