Stock Photo - 19 April 2021, North Rhine-Westphalia, Cologne: A pupil takes a Corona antigen rapid test before the start of lessons at the Katharina Henoth Comprehensive School. After a week of lessons at home, many children and adolescents in North Rhine-Westphalia have been able to return to their schools for face-to-face lessons since Monday. Photo: Marius Becker/dpa. - Cologne/North Rhine-Westphalia/Germany

Stock Photo: 19 April 2021, North Rhine-Westphalia, Cologne: A pupil takes a Corona antigen rapid test before the start of lessons at the Katharina Henoth Comprehensive.

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