After a six-week delay, the US Food and Drug Administration has approved Novavax’s Covid-19 vaccine, according to a letter from the agency, but only for people 65 and older and those 12 and up who have at least one underlying condition that puts them at higher risk of severe illness.

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

Trump admin's new FDA update limits annual COVID shots to high-risk groups, ending routine access for healthy kids and adults.

Covid shots are facing greater scrutiny from top federal health officials like RFK Jr. and the FDA's Marty Makary.

Novavax shares jumped more than 15% on Monday after the company secured a long-awaited U.S. regulatory approval for its COVID-19 vaccine, albeit with new conditions, which helped allay some investor concerns over the future of the shot.

WASHINGTON — Robert F. Kennedy Jr. clinched the political support needed to become the nation’s top health official by pledging to work within the decades-old federal system for approval and use of vaccines. Yet his regulators are promising big changes that cloud the outlook for what shots might even be available.