No I doubt that. Yeah there is a chance but a very very very very very remote chance. Enclave spent decades working on it. They have super computers to test out any possability.
these are the same people that thought issuing a bunch of social experiments that would beneefiti them, while they were, simultaneously living out the scenario where it could help them. I'm just saying.. not too rational, those guys.
Here is the thing though.
If they had actually carried out the plan, every new generation would ahve to be innoculated.
Every new generation would mutate naturally, as any species does/has done. Without knowing what those mutations will be, how can they possibly test out "any possibility"
combine that with viruses naturally mutating? at the least they would have to be perpetually making a new innoculation.
It does bering about a great nefarious scenario though, where the enclave gets selective about its ranks/citizens and some dont get the right stuff.. ooops.