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"Controls will be performed at Switzerland's borders to prevent the influx of foreigners from the most affected countries, particularly Italy. Sommaruga said that Schengen agreement allows individual members to take these restrictive measures in special situations. Exceptions will be made for Swiss citizens and permanent residents returning to Switzerland, as well as foreigners employed in Switzerland."
https://www.zermatt.ch/en/liveticker for the stuff about ski resort closing (you can still ski tour, but meh)
You sure as cant see anything to back this up?