A medical staff prepares Pfizer's COVID-19 vaccine at a vaccination site in Boulogne Billancourt, outside Paris, Wednesday, Dec. 1, 2021. The new potentially more contagious omicron variant of the coronavirus popped up in more European countries on Saturday, just days after being identified in South Africa, leaving governments around the world scrambling to stop the spread. (AP Photo/Christophe Ena)
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