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He then seems to have said, "Hmmmm. I've been exposed. I'm sure I'm going to die. I should quit my job, fly to America, and seek top medical help. Certainly I feel fine, there's no trace of any symptom, but I know I've received a death sentence."

Duncan had to have started planning his trip at least three months before he was exposed, because that's how long it take to get a visa. Unless I'm misremembering, he also bought the ticket and quit his job before being exposed.

Arguably he should have remained in Africa because he knew he might become sick, but your theory just doesn't fit the timeline.

Duncan had to have started planning his trip at least three months before he was exposed, because that's how long it take to get a visa.

Oh, hadn't you heard?? Duncan got his visa in August, thanks to the administration's change in policy to streamline visa requests from west Africa (implemented after ebola hit the urban centers):

http://townhall.com/tipsheet/katiepavlich/2014/10/17/wow-obama-adminstration-started-streamlining-visas-from-west-africa-in-august-at-height-of-ebola-crisis-n1906576