Our first line of defense is airport enhanced screening. Which fumbled at first but seems to be working well now.
Limiting incoming int’l flights to designated airports was super smart - as the 8K or so Calif alone has corralled at their two entry point demonstrates. If we can keep tracking, we’ve got half the game won. Let the MSM moan and groan, but President Trump has made all the right moves.
With this virus, screening is useless due to the asymptomatic carriers.