Pfizer to test vaccine in larger group of children under age 12

Pfizer said on Tuesday it will begin testing its COVID-19 vaccine in a larger group of children under age 12 after selecting a lower dose of the shot in an earlier stage of the trial, Reuters reported.

The study will enroll up to 4,500 children at more than 90 clinical sites in the United States, Finland, Poland and Spain, the company said.