This will render any vaccines or ZMapp treatments useless.
Makes me wonder if the patients who received ZMapp and died had a strain different enough for the ZMapp to be useless.
If the virus is that unstable, I am led to suspect it may have been artificially fabricated. (i.e. a man-made root virus formulated in the lab and let loose as a weapon or trial.)
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.