mdd,
Note that in the Dallas case, none of the family members caring for Mr. Duncan became infected, nor did the emergency responders. Although your scenarios are not impossible, they are improbable.
1. I don’t think that coughing and sneezing are primary symptoms of Ebola. Someone hacking away behind you on the bus probably doesn’t have Ebola, but may give you a cold or the flu.
2. It seems that Ebola becomes increasingly contagious as the infected person becomes sicker. Except for Mr. Duncan, every Ebola patient in the U.S. so far has been isolated very quickly following the onset of symptoms.
3. Nurses are much more likely to come into contact with bodily fluids during the course of their work than others. Taking specimens or cleaning up after an Ebola patient is much, much riskier than simply being near him/her.
I’m not meaning to say that there is no cause for concern, there certainly is, but I don’t think it’s accurate or a good idea to proclaim that our “health officials” are lying to us.