Federal Judge Blocks Kennedy's Overhaul of U.S. Childhood Vaccine Schedule, Invalidates Reconstituted Advisory Panel
A federal court has halted sweeping changes to the national childhood immunization schedule and frozen Kennedy's ACIP appointments, finding the reconstituted panel likely violated federal law.
Overview
A federal judge in Boston has temporarily blocked Health and Human Services Secretary Robert F. Kennedy Jr.’s sweeping overhaul of the nation’s childhood vaccine schedule, ruling that the changes and the reconstituted advisory panel behind them likely violated federal law. The March 16 preliminary injunction, issued by U.S. District Court Judge Brian E. Murphy, freezes a revised immunization schedule that had cut recommended childhood vaccines from 17 diseases to 11 and invalidates decisions made by Kennedy’s hand-picked replacements on the Advisory Committee on Immunization Practices (ACIP).
The ruling marks the most significant legal setback to Kennedy’s vaccine agenda since he took office and restores, at least temporarily, the prior science-based recommendations that had been in place for decades.
What Changed Under Kennedy
The contested overhaul began in mid-2025 when Kennedy fired all 17 independent experts who had served on ACIP, the panel whose recommendations form the backbone of national immunization policy. He replaced them with 13 new appointees, several of whom had publicly questioned established vaccine research.
In January 2026, the CDC published a heavily revised childhood immunization schedule that reduced the number of diseases covered from 17 to 11. According to NBC News, the changes dropped universal recommendations for hepatitis A, hepatitis B, RSV, dengue, and two types of bacterial meningitis, moving some to high-risk-only categories. A December 2025 ACIP meeting had also downgraded hepatitis B vaccine recommendations for newborns.
The Ruling
Judge Murphy sided with the American Academy of Pediatrics (AAP) and more than 200 medical organizations — including the American Medical Association, March of Dimes, and Autism Science Foundation — that had sued HHS, arguing the changes violated federal law.
The court found that the reconstituted ACIP likely violated the Federal Advisory Committee Act’s requirements for balanced membership and adequate expertise. In a pointed assessment of the new panel’s qualifications, Murphy wrote that “even under the most generous reading, only six appear to have any meaningful experience in vaccines — the very focus of ACIP,” according to CBS News.
“There is a method to how these decisions historically have been made — a method scientific in nature and codified into law through procedural requirements,” Murphy wrote in the ruling, as reported by CBS News. “Unfortunately, the Government has disregarded those methods and thereby undermined the integrity of its actions.”
What the Injunction Does
The preliminary injunction has several immediate effects. It stays the revised childhood immunization schedule published in January 2026, blocks all 13 of Kennedy’s ACIP appointments from continuing to serve, and invalidates votes the reconstituted panel had taken since June 2025 — including the decision to eliminate hepatitis B recommendations for newborns. A two-day ACIP meeting that had been scheduled for the week following the ruling was postponed.
The practical effect is that the prior vaccine schedule — recommending immunizations against 17 diseases — is restored as the operative federal guidance while the case proceeds.
What We Don’t Know
Several questions remain unresolved. The injunction is a preliminary measure, and a full trial on the merits has not yet been scheduled. HHS has indicated it plans to appeal the ruling, according to CNBC, raising the possibility that the case could eventually reach the Supreme Court.
It is also unclear how states and insurers will respond in the interim. Federal vaccine recommendations have historically driven state-level school entry requirements and insurance coverage decisions, and the legal uncertainty could create a patchwork of policies across the country.
Reactions
AAP President Dr. Andrew Racine said the ruling “effectively means that a science-based process for developing immunization recommendations is not to be trifled with,” according to CBS News. An HHS spokesperson told NBC News that the department “looks forward to this judge’s decision being overturned.”
The lawsuit was originally filed in July 2025 and amended in January 2026 after the revised vaccine schedule was published. The case, brought by the AAP and its co-plaintiffs, is being heard in the U.S. District Court for the District of Massachusetts.