[Dont Tread On Me Eh?]

Then there's the option of just banning people from certain nations for a time. There are options

The third-highest rate of SARS in the world is in Canada - with the amount of trade ($1.25 billion DAILY) between the U.S. and Canada, it's utterly absurd to consider closing that border.

[riri]

with the amount of trade ($1.25 billion DAILY) between the U.S. and Canada, it's utterly absurd to consider closing that border

What makes all that trade occur in the first place is commerce. No one is going to be buying, building or selling anything if everyone is too afraid to leave their house, hospitalized or dead. This thing is a fiasco anyway you slice it, if it can't be contained.