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Security staff (EPFL Covid Angel) checks a classroom full of students after controlling at the entrance the Covid Certificate on the first day of university schools at the Swiss Federal Institute of Technology (EPFL) during the coronavirus disease (COVID-19) outbreak, in Lausanne, Switzerland, Tuesday, September 21, 2021. The Covid pass will be required from 20 September for students to attend classes. Many universities in Switzerland will introduce the Covid-19 certificate. (KEYSTONE/Laurent Gillieron)