Yanno...........it's been said repeatedly over the news channels that if a person is NOT exhibiting symptoms of Ebola (fever, aches, vomiting, etc.) then they are very low risk for transmitting the disease.
One of the things that makes Ebola so virulent over in West Africa is the fact that when a person starts to exhibit signs of the disease (fever, aches, vomiting, etc.), THAT is the point that they become infectious, as well as the fact that the virus continues to multiply from that point forward, even until after the death of the host, which is when it is most virulent.
They don't have the same kind of facilities (i.e. sewage, running water and health facilities) that we do over here, which is why the disease spreads so quickly over there.