They're getting it from their Personal Protective Equipment (PPE) when they take it off.
There is ZERO epidemiologic evidence from Africa or from Dallas of airborne transmission.
It doesn’t need to be airborne - the guys was spewing bodily fluids and their suits were primitive.
However, I think these exposed workers were coddled and not given the truth. If this young woman had known how at risk she truly was, she wouldn’t have gone to Ohio to expose loved ones.