Pfizer study finds COVID-19 vaccine is 100% effective, safe for kids 12 to 15

In a study of more than 2,200 kids between 12 and 15 years old, Pfizer found that its COVID-19 vaccine is fully effective and safe. Dr. Susannah Hills spoke with Anne-Marie Green and Vladimir Duthiers on CBSN about what this study means for school reopenings and herd immunity in the U.S.