Pfizer's Covid-19 vaccine was 90.7% effective in 5 to 11 year olds in clinical trials, according to new FDA documents. CNBC's Meg Tirrell reports. For access to live and exclusive video from CNBC subscribe to CNBC PRO: https://cnb.cx/2NGeIvi

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 as the U.S. considers opening vaccinations to that age group.

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