The move drew sharp criticism from medical and health experts. “Scrapping the fastest platform we have is a reckless move rooted in a fundamental misunderstanding of vaccinology,” wrote Jake Scott, an infectious diseases specialist and clinical associate professor of medicine at Stanford University, on the social media site Bluesky.

This was one in a continuing line of moves that has put RFK Jr.'s vaccine skepticism into public policy, though scientists say the vaccines are safe.