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Being barred to enter a country because of a lack of vaccination is nothing new from the pre-Covid-19 era. Like Brazil requires a Yellow Fever vaccination for people from some African countries.

There are probably about 100 other reasons they can be banned from entry if they don't comply. Saying they are "banned" if they don't get a vaccination (even though of course it's not a ban, it's a "de facto" ban) is no more interesting than if they're "banned" if they won't submit to a search, or if they've filled their car with fruit.

That is the entire point. International travel is not for the plebs.