Unfortunately this disease is only a plane ride away to the U.S. as we are an open society. Although there is some thought of rudimentary screening at international airports, that wouldn't be effective unless medical personnel were stationed there on a 24 hour basis. Of course there are illegal aliens to further muddy the waters. I don't think there is the political will to do what needs to be done.
So what can we do? Probably not a damn thing.
@rocket:
That and if they're not shoing symptoms yet, it would be a waste of time.