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A nurse administers the Pfizer-BioNTech COVID-19 vaccine to Roland Grunder, right, co-president of the Swiss Association of Seniors surrounded by media during the vaccinations against the coronavirus disease (COVID-19) on the opening day of the vaccination centers in the canton of Vaud at the University Hospital (CHUV), in Lausanne, Switzerland, Monday, January 11, 2021. (KEYSTONE/Laurent Gillieron)..Une infirmiere vaccine a l'aide du vaccin Pfizer-BioNTech Roland Grunder, droite, copresident de l'Association Suisse des Aines entouree de nombreux medias lors de l'ouverture des centres de vaccination dans le canton de Vaud pendant la pandemie de Coronavirus (Covid-19) au centre de vaccination du Centre Hospitalier Universitaire Vaudois, CHUV, ce lundi 11 janvier 2021 a Lausanne. (KEYSTONE/Laurent Gillieron)