FILE - In this Jan. 11, 2021, file photo, a preschool student gets his temperature checked as he walks into Dawes Elementary School in Chicago. Pressure is building on school systems around the U.S. to reopen classrooms to students who have been learning online for nearly a year, pitting politicians against teachers who have yet to be vaccinated against COVID-19. (Ashlee Rezin Garcia/Chicago Sun-Times via AP, Pool, File) (Ashlee Rezin Garcia/Sun-Times/AP) 08 de febrero 2021 a las 14:29 hrs.PUBLICIDADTags