The Associated Press Aspen Valley Hospital clinical pharmacist Kelly Atkinson organizes the empty vials of the Pfizer-BioNTech COVID-19 Vaccine in the command unit trailer set up next to the vaccination tent in the Benedict Music Tent parking lot in Aspen on Jan. 14, 2021. To keep track of the empty vials, the pharmacists labeled them with individual numbers. Before the vaccine is diluted, the unused vial of vaccine looks identical to the vials after the doses have been taken out. (Kelsey Brunner/The Aspen Times) WASHINGTON — The U.S. Food and Drug Administration is expected to authorize Pfizer’s COVID-19 vaccine for youngsters ages 12 to 15 by next week, according to a federal official and a person familiar with the process, setting up shots for many before the beginning of the next school year.