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An empty classroom where all his students have been confined due to Coronavirus infection in a public school in Barcelona, Spain, Friday, Jan. 21, 2022. On Friday Spanish authorities said that nearly 25,000, or 4.3% of the country's teachers were on medical leave and that over 260,000 of 8.2 million students had been told to isolate since classes resumed in the new year. (AP Photo/Emilio Morenatti)