It is also authorized for emergency use in children 5 to 15 years old and is awaiting emergency use authorization by the FDA for children 6 months through 4 years old. Spikevax, the brand name of the vaccine developed by Moderna, was authorized for emergency use on Dec. 18, 2020, and gained full FDA approval for use in adults 18 years and older on Jan. 31, 2022. The Johnson & Johnson vaccine followed the Pfizer and Moderna vaccines out of the pipeline and into use. The FDA granted the Johnson & Johnson vaccine an emergency use authorization on Feb. 27, 2021. It has not yet received full FDA approval.