There are numerous posts asking about what to do if you get Covid. Here is a USAToday/Christopher Elliott artice on how to do that:
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Bainbridge Island
3281 posts
It doesn’t really address Europe much—-it’s more about Caribbean resorts, cruises, safaris.
And he doesn’t mention carrying a Binax Now monitored test kit as a way to test before returning to the US, instead of trying to find a test site in the foreign country. That would have been more helpful, I think.