As I am going to say, America doesn’t have that many strict isolation Wards in a given hospital. It won’t take too many cases of ebola to overload the isolation units. If ebola makes it into the slums or the homeless people, you will see it spread like a brush fire. If it gets far enough before containment, a huge fraction of the entire U.S. population will die in not so much time.
Not that it won’t wipe out the homeless an underclass, but I think it will be an indiscriminate killer. Just forget about any public transportation or public areas. Who will risk traveling to work on a bus or subway.