The drugmaker Moderna said on Wednesday that it would soon begin testing its coronavirus vaccine in children ages 12 through 17. The study, listed Wednesday on the website clinicaltrials.gov, is to include 3,000 children, with half receiving two shots of vaccine four weeks apart, and half getting placebo shots of salt water.
But the posting says the study is “not yet recruiting,” and Colleen Hussey, a spokeswoman for Moderna, said it was not certain when the testing sites would be listed or start accepting volunteers. A link on the website to test centers is not yet working, and Ms. Hussey said she was not sure when it would become active.
Moderna announced on Monday that data from its study in 30,000 adults had found its vaccine to be 94.1 percent effective, and that it had applied to the Food and Drug Administration for emergency authorization to begin vaccinating adults. If approval is granted, certain groups of high-risk adults, including people in nursing homes, could receive shots late in December.