Per my understanding of things, that seems frighteningly unlikely[1]. As I understand it, there are a substantially greater portion of health workers getting sick than in previous outbreaks, and those health workers are not tied to a particular location. If that's the case (and mind you, this is all very much Nth hand what-I-got-from-the-radio stuff - either of those could certainly not be the case) then it seems to follow that probably this strain of ebola has some attribute that makes the recommended countermeasures inadequate (at least the countermeasures recommended for deployment in the field, which may or may not be this set of countermeasures).
[1]: That isn't to say "tremendously unlikely", just "unlikely enough to be frightening."