I just read about the first case in a Liberian county. NINE of his family died earlier in the month, so he left home, and gt sick in Zwedru, Liberia. It looks like you are right about it being too late to change the course of it, at least in the countries affected in West Africa. I saw a time lapse video of airline travel - seems to be a lot from Africa to South America, but could be just a fluke of the video.
I was wrong about the traffic from Africa... I misremembered the amount of traffic from SA to Africa. http://www.youtube.com/watch?v=yx7_yzypm5w