https://at.usembassy.gov/covid-19-information/ https://www.austria.info/en/service-and-facts/coronavirus-information
Vienna: https://www.wien.info/en/travel-info/corona-information
https://it.usembassy.gov/covid-19-information/ https://www.esteri.it/it/ministero/normativaonline/focus-cittadini-italiani-in-rientro-dall-estero-e-cittadini-stranieri-in-italia/ Vatican City: https://va.usembassy.gov/covid-19-information/
ie.usembassy.gov/covid-19-information/#:~:text=Entry%20and%20Exit%20Requirements&text=You%20no%20longer%20need%20to,confirmed%20case%20of%20COVID%2D19
https://pl.usembassy.gov/covid-19-information/ https://www.gov.pl/web/coronavirus