Police officers and wait in a line to receive their COVID-19 vaccine at the Brussels Expo center in Brussels, Thursday, March 4, 2021. The Expo is one of the largest vaccination centers in Belgium. (AP Photo/Olivier Matthys)
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Police officers and wait in a line to receive their COVID-19 vaccine at the Brussels Expo center in Brussels, Thursday, March 4, 2021. The Expo is one of the largest vaccination centers in Belgium. (AP Photo/Olivier Matthys)
