Oorang said: Search any travel website (kayak, expedia) and you will see flights for this week and over the next few weeks from Lagos, Nigeria to the US. United airlines: Lagos direct to Houston. Delta airlines: Lagos direct to Atlanta.
As of Sept. 20, the last person under surveillance in Nigeria has been found to be free of Ebola. That means that the chain of transmission has been broken and the only cases would be those who are still in the hospital. Once Nigeria has gone 2 full incubation periods (total 42 days) without a new case, it will be officially Ebola-free.
Nigeria is not within walking distance of Sierra Leone, Guinea, or Liberia.
The average person in those countries lives on about $3 per day. I don't think they will do much palm-greasing. I do not think the ones who can afford a flight out are going to try sneaking in the back door.
Once more: the affected countries are not exclusively inhabited by "average" people. The majority are indeed dirt poor. There are, however, wealthy people in each affected country.
When things get bad, or if a wealthy person feels he has been exposed, the wealthy WILL use all the money they have in order to get out of there and to the West.
And if the front door is shut to them, then they WILL try the back door.