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Security staff controls the Covid Certificate of a student before enter into a classroom on the first day of university schools at the University of Lausanne (UNIL) 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)