Pfizer study tests extra COVID vaccine dose for kids under 5

Published December 17, 2021 12:04 PM

By LAURAN NEERGAARD
AP Medical Writer

Pfizer is testing an extra dose of its COVID-19 vaccine for babies and preschoolers enrolled in a study of the shots. Pfizer had been testing two very low-dose shots in children under age 5, with some data expected by year’s end. But Pfizer and its partner BioNTech announced Friday they were adding a third dose to the study after a preliminary analysis found 2- to 4-year-olds didn’t have as strong an immune response as expected. It’s not clear how much the study change will delay the quest for vaccinating the youngest children.

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