A federal court injunction on Monday put a check on Health Secretary Robert F. Kennedy Jr.'s rapid assault on U.S. vaccine recommendations, but months of turmoil and misinformation have sown doubt about vaccines that will be hard to reverse.

“The ​genie is out of the bottle. We’re going to have to live with that,” said Michael Osterholm, director of the University of Minnesota’s Center for Infectious Disease ‌Research and Policy.

The decision, issued in a lawsuit brought by the American Academy of Pediatrics and others against Kennedy and the Health Department, reverses key parts of Kennedy’s moves to reshape U.S. vaccine policy, including reducing the number of shots routinely recommended for children.