In theory possibly.
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The current outbreak of Ebola in West Africa is now the largest in history, but how likely is it to spread to the United States or other countries around the world?

It’s theoretically possible that people with Ebola could travel to other countries on planes, and infect others outside the region. However, it’s extremely unlikely that the virus would then cause further outbreaks in communities in the United States or other developed countries with systems in place to contain such deadly infections, experts say.

One reason why the Ebola virus’s spread is possible in theory is that it can take up to 21 days for an infected person to show symptoms. That’s ample time for someone with Ebola to travel a long distance by plane and arrive in the United States or Europe, said Derek Gatherer, a researcher at Lancaster University in the United Kingdom who studies virus genetics and evolution.