We have no choice at this point.
But, we should be banning all incoming and outgoing flights from everywhere to everywhere.
For every passenger that we screen (from a “hot spot”) there are probably a dozen that come in that could be carrying the virus (without symptoms) from other countries that are not “hot spots”.
My analogy is putting a triple lock on the front door while the side door is off the hinges.
The really dumb meth heads might be deterred from robbing the house, but I wouldn’t call it an adequate or reasonable approach to the problem. ;-)
one of those side doors is China. Did you notice my post early this evening about Canada refusing to stop China flights? With their socialized medicine, they will be overwhelmed before they can say corona. We need to close the northern border until they smarten up.