Okay then here's the thing. Did he suspect he had Ebola...or did he KNOW he had ebola? If he only suspected it would have been nuts to leave if he didn't have any symptoms. But if he had symptoms then he must have guessed he had ebola.
But here's the kicker. If he KNEW he had ebola because of early symptoms that means that he had symptoms as he was traveling through all the airports and getting on all the airplanes.
We'll know in a week or two...
I believe possible they've issued this alert because infected people are masking their fevers throughout Africa, and at airports, while passing through checkpoints so they won't be stopped........ I believe this is likely what Duncan did.
How about he knew he likely had Ebola?