A medical worker wearing protective gear, waits for patients to receive the COVID-19 vaccine at a vaccination center in Belgrade, Serbia, Wednesday, February 17, 2021. Serbia, a country of 7 million, has so far vaccinated some 1 million people, mainly with the Chinese Sinopharm vaccine and Russian Sputnik V, and to a lesser extent with the Pfizer jab. (Photo by Darko Vojinovic/AP Photo)
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