Nurse Lydia Holly prepares a child's COVID-19 vaccine dose, on Nov. 3, 2021, at Children's National Hospital in Washington. U.S. regulators are urging drugmaker Pfizer to apply for emergency authorization for a two-dose regimen of its COVID-19 vaccine for children ages 5 and under while awaiting data on a three-dose course, aiming to clear the way for the shots as soon as late February. (AP Photo/Carolyn Kaster, File)
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