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A medical worker holding a tray with the AstraZeneca COVID-19 vaccine walks by vaccination booths in Lisbon, Portugal, March 27, 2021. Portugal on Saturday started vaccinations of some 78,700 teachers and workers from pre-schools and schools of the first four years of the nine-year basic education. They are listed as one of the priority groups for the resumption of classes. (Photo by Pedro Fiuza/Xinhua)