The US had active uncontained clusters, and was known to have them, two weeks ago. Once that's true, there's no way that mere travel numbers are going to move that needles significantly.
Again: we banned travel from China and it was too late already. This does not work. And I'm horrified at the number of people on this site that don't see that.
If it's done in time to prevent the bulk of that initial caseload, which is almost certainly not the case here.
It did not matter, because patient-0 in Europe was a German. It’s now accepted that the virus arrived by crossing the Alps in some sort of Euro-business trip, not directly from China.
Unless you can read minds, these things happen very quickly now that the world is a global village.
It's going down in the US too! We're merely a few days behind. If we had no cases, or a few contained clusters, then this would be an arguably useful policy. We have multiple uncontained outbreaks already, and have yet to enact meaningful policies to contain them.
It's too late. All this ban does is try to shift blame.