The hurdle is that COVID vaccine makers are only in the early stages of testing their products on children. The Pfizer vaccine authorized for use by the Food and Drug Administration on Friday was greenlighted only for people ages 16 and up. It will take months to approve use of the vaccines for middle- and high school-aged kids, and months more to test them in younger children. Meissner abstained from the committee’s vote Thursday that supported, by a 17-4 vote, an emergency authorization of the Pfizer vaccine for people 16 and older. Federal scientists hope to get that data from the Moderna and Pfizer adult vaccine trials, she said.