Entirely possible.
What will make this especially difficult to contain is the unprecedented number of human bioreactors out there not only serving as a breeding ground for the virus, but for mutation.
Add in the other species which humans commonly have contact with--intentional or otherwise, from canines to rodents, and there is more host biomass than ever known to exist.
Unfortunately we have a little while yet to wait before we find out if those who "tested negative for Ebola" in several countries were, in fact, negative.
I pray that is the case, otherwise, this has already spread far beyond its known limits.
The diagnosed patients are where ebola was roughly 2 weeks ago. Where ebola is now is anyone’s guess.