A federal judge has temporarily blocked a plan by Robert F. Kennedy Jr. to make sweeping changes to the U.S. childhood vaccine schedule, marking a significant legal setback for the administration. The decision, issued by Brian Murphy, places a preliminary injunction on key parts of the proposal, including efforts to restructure the advisory body that helps guide national immunization recommendations.

At the center of the dispute is the role of the Centers for Disease Control and Prevention and its advisory group, the Advisory Committee on Immunization Practices. The court found that the agency did not follow proper legal procedures when attempting to revise the vaccine schedule earlier this year. Specifically, the ruling points to concerns about how changes were introduced without sufficient consultation and whether the advisory panel itself had been lawfully reconstituted.

The case was brought forward by the American Academy of Pediatrics along with other medical groups, who argued that the proposed revisions could undermine established public health processes. They contended that altering vaccine recommendations requires adherence to clear regulatory standards and expert input, particularly given the broad impact such decisions have on children’s health nationwide.

For now, the injunction preserves the existing vaccine schedule while the case proceeds through the courts. The ruling underscores the importance of procedural safeguards in public health policymaking, especially when proposed changes affect long-standing medical guidelines relied upon by healthcare providers and families across the country.