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This October 2021 photo provided by Pfizer shows kid-size doses of its COVID-19 vaccine in Puurs, Belgium. The 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. (Pfizer via AP)

This October 2021 photo provided by Pfizer shows kid-size doses of its COVID-19 vaccine in Puurs, Belgium. The 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. (Pfizer via AP)

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