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Sofia, Bulgaria - 18 January, 2021: A vial of the Pfizer-BioNTech vaccine against COVID-19 is shown by a medical staff member at Aleksandrovska Univer
Sofia, Bulgaria - 18 January, 2021: A vial of the Pfizer-BioNTech vaccine against COVID-19 is shown by a medical staff member at Aleksandrovska University Hospital.
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