The rollout of updated Covid vaccines for healthy children and adults this fall is likely to be delayed after the FDA said it will require another clinical trial.

In an editorial article published in the New England Journal of Medicine, Dr. Vinay Prasad, the newly appointed head of the Center for Biologics Evaluation and research at the FDA, and Dr. Martin Makary, FDA commissioner, explained their plan for how the FDA will evaluate and recommend COVID-19 vaccines going forward.