Beware of writers who possibly don’t understand what exponential growth rate is. A single-match flame that quickly grows into a forest fire is an example of exponential growth rate. And that’s how ebola will possibly spread if not stopped soon.
What’s really the problem is the fact that people are going to get tired of having unnecessary Ebola cases in the U.S.. At this point, the question becomes that of where is next after NYC, or if someone else contracted the virus in the large area covered. It’s not likely, but not impossible, that a few more people were exposed.