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:
Posted by
Bainbridge Island
3272 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.