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FILE - This Feb. 5, 2021, file photo shows the Pfizer logo displayed at the company's headquarters in New York. Kid-size doses of Pfizer’s COVID-19 vaccine appear safe and nearly 91% effective at preventing symptomatic infections in 5- to 11-year-olds, according to study details released Friday, Oct. 22, as the U.S. considers opening vaccinations to that age group. (AP Photo/Mark Lennihan, File)