No, it doesnt skyrocket.
Look at the onyl people to be infected in this country: two of the nurses who were in close contact with an infected man after he was sick. None of the people who were on the plane with him.
the chances to be infected are so low because the transmissibilty of Ebola is on the very low end of diseases. First, the person has to be showing symptons. People not showing symptoms are not contagious. Preventing its spread really is as simple as good hygeine, not coughing on people or getting coughed on, isolating patients, santizing equipment and room. The transmissibility of ebola is NOTHING like that of hte cold, the flu, or measles.
Our culture, our sanitary habits, our medical system and our faith in it, are far different from that in Africa. Differences that have contributed to its spread over there. We have top notch medical in this country that we dont fear (death squads masquarading as "medical teams" arent a thing over here), we nearly all of us practice obsessive hygiene and sanitation, we dont keep living in the same 1 room home with a patient who is infected after they become infected, and we dont leave dead infected bodies rotting in the open cause we're afraid to bury it.
If a whopping 2 people getting infected scares you, think on this: last year there were over 60,000 motor vehicle deaths, 40,000 gun deaths, and 36,000 deaths to the flu.
I say it again: Ebola is a non threat, regardless of your ignorance or that of whatever news/panic-machine youve been watching.