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From 1st hand experience: all of it! I was on a stag do in March. We spent the whole day touring having no contact with other groups, then went to a packed après bar and threw beer on each other after having watched the rugby shoulder to shoulder in a pub. 6 of us almost certainly got Covid (testing wasn’t available at the time).
The attitude in the Swiss resorts was super relaxed until the end of march.
I do wonder how much of last year's outbreak was down to apres ski rather than ski lifts.