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Health worker speaks with a person after administers the Pfizer-BioNTech COVID-19 vaccine during the vaccinations against the coronavirus disease (COVID-19) on the opening day of the vaccination centers in the canton of Vaud at the eHnv hospital (Etablissements Hospitaliers du Nord Vaudois), in Yverdon, Switzerland, Monday, January 11, 2021. (KEYSTONE/Laurent Gillieron)