Kids on Cusp of Adult Covid Shots Set Off Queries for Doctors

The questions started pouring into adolescent medicine specialist Hina Talib’s inbox almost as soon as Pfizer Inc. announced its Covid-19 vaccine for 5- to 11-year-olds was safe and effective: What about children on the cusp of adult and pediatric doses?

A vaccine for nearly all school-age children could become available by the end of October, after Pfizer and its partner BioNTech SE announced they sent initial data to the Food and Drug Administration about the use of their Covid-19 vaccine in children ages 5 to 11. It is the only vaccine that’s fully approved for everyone 16 and up, ...