Pfiz­er plans to study a third shot for its Covid-19 vac­cine in the youngest kids, push­ing back its time­line far­ther

Amer­i­can chil­dren un­der the age of five may not be vac­ci­nat­ed un­til mid-2022, as Pfiz­er said Fri­day that it’s go­ing to now test a third …

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