The U.S. Food and Drug Administration approved Novavax's COVID-19 vaccine, but limited its use to older adults and people over the age of 12 with conditions that put them at risk due to the illness. The vaccine's prospects were thrown into doubt after the FDA missed its April 1 target to approve the shot,

The agency narrowed who can get the shot and added new study requirements that could cost the company tens of millions.

The Food and Drug Administration has issued a long-awaited approval of Novavax’s COVID-19 vaccine but with unusual restrictions. Novavax makes the nation’s only traditional protein-based coronavirus vaccine – and until now it had emergency authorization from FDA for use in anyone 12 and older.