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    00:30
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Pfizer vaccine shown to be 100 percent effective on children as young as 12

02:32

Tested on children as young as 12, Pfizer’s vaccine has been shown to be 100 percent effective – a promising development for millions of families and the push to reopen schools. But the coast-to-coast surge in COVID-19 cases and hospitalizations is fueling mounting concern from health officials. NBC’s Miguel Almaguer reports for TODAY.