I think I undesratb what he is trying to say, and his point is actually logical (to a point), but explained horribly. I think that what he was getting at is that (a) Ebola is spread through bodily fluids, so unless the Ebola patient is actively vomiting/bleeding/etc, you are unlikely to get it simply sitting on a bus with someone who has it, but (b) if you have Ebola, you way we’ll start vomiting and bleeding and the like, so you should avoid getting on buses where you may end up vomiting/etc on others.
When in doubt, check your assumptions.
/.02