The US Food and Drug Administration offered treats and probably a little bit of a scare to COVID vaccine sponsors on the Friday before Halloween when it gave Pfizer Inc. emergency use authorization for its COVID-19 vaccine in children 5-11 and then apparently told Moderna, Inc. that safety concerns would extend the review of its vaccine for use in 12- to 17-year-olds.
Moderna announced on 31 October that “on Friday evening, the FDA informed Moderna that the agency requires additional time to...






