[titzer]

> To date, I'm aware of no study that has quantified a difference in infection, hospitalization or death that is attributable to travel bans.

You have got to be joking, because NZ, Taiwan, and Australia all achieved COVID zero by effectively quarantining their countries, i.e. travel bans. It's basic logic that viruses cross borders and oceans via infected people, not by wafting magically through the air.

That said, travel bans are only effective in the very early phase, when infections are near zero. The US, Europe, and most of Asia are highly connected and by the time COVID infections were spreading, it was pretty much too late. Also, the US's travel bans were not particularly ineffective. Like the US's entire response, haphazard, half-hearted, and actively opposed by lots of weaponized ignorance.