Exactly; even the best specialist can slack off every once in a while.
Sometimes it is not even really “slacking off.”
If you have ever been trained for hazmat work or pharmaceutical clean room work it can be astounding that one is so conscious and so careful...and yet you still...still ...come up contaminated or with a hot particle.
So given the situation on the ground there, I’d be hard pressed to think we wouldn’t have people providing care turning up with ebola.