> You can't and couldn't possibly know that. Nobody could Not with that attitude... Yes you can, there are plenty of ways of comparing regions or countries wit

> You can't and couldn't possibly know that. Nobody could Not with that attitude... Yes you can, there are plenty of ways of comparing regions or countries with high and low vaccination rates, or vaccination uptake. (Of course only while demographically adjusting, but the people who do these studies surprisingly often do think about the basic gotchas.)