This isn't a disease to play around with. Hardcore mandatory quarantine all that have been possibly exposed. Not in their homes, but in a facility. Treat it as more communicable than it is, because it could change. If I was on a plane with that guy, I should expect to be held in quarantine. Asymptomatic or not, people still do contaminating behaviors all the time: coughs, sneezes, spit when they talk, wipe or pick their nose, poorly wash their hands (if at all), nervous sweat at take off or landings, etc etc.
And... For goodness sake, stop people from travelling to and from Africa, would you please? Isolate that dang continent until this is over, as much as possible. The average Joe should not be able to get there, at all. And any medical personnel going there, mandatory quarantine before they can return. Anyone breaking these rules that causes the disease to spread should be tried for murder.
Quit screwing around with ebola, or this is going to be the plague that took care of overpopulation... in a big way.