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An empty chair is left in a hallway next to a Christmas tree in the COVID-19 ward at the St. Michiel Hospital in Brussels, Tuesday, Nov. 24, 2020. Nations are struggling to reconcile cold medical advice with a holiday tradition that calls for big gatherings in often poorly ventilated rooms, where people chat, shout and sing together, providing an ideal conduit for a virus that has killed over 350,000 people in Europe so far. (AP/Virginia Mayo)