A judge stayed the reconstituted CDC vaccine panel and its January schedule changes

A federal judge in Massachusetts has stayed the reconstituted Advisory Committee on Immunization Practices and the January memo that rewrote the CDC's childhood vaccine schedule, ruling that the government likely violated two federal statutes when it carried out both changes [s1]. The order, issued 16 March by U.S. District Judge Brian E. Murphy in American Academy of Pediatrics v. Kennedy, effectively reverts the recommended schedule to its pre-January form while the underlying lawsuit proceeds [s1] [s2].

Judge Murphy opens the 45-page opinion with a line from Carl Sagan: "Science," like law, "is far from a perfect instrument of knowledge" — but it is, Sagan argued, "the best we have" [s1]. The framing sets up the order's core finding: that the process the government used to change vaccine policy, not the underlying vaccine science, is what the court found unlawful.

What the court found

The case centers on two government actions taken since June 2025: the removal of all sitting ACIP members and their replacement with new appointees, and a January 2026 memo that revised the childhood immunization schedule [s1]. The court concluded that plaintiffs — the American Academy of Pediatrics and six other medical and public health organizations — are likely to succeed in showing that both actions violate the Administrative Procedure Act, and that the ACIP reconstitution also likely violates the Federal Advisory Committee Act's requirement that advisory committees be "fairly balanced" in their membership [s1].

On the schedule change, the court's reasoning was procedural rather than a judgment on any individual vaccine recommendation: the government bypassed ACIP entirely to issue the January memo, which the opinion calls "both a technical, procedural failure itself and a strong indication of something more fundamentally problematic" [s1]. On the committee itself, the court found that HHS replaced all of ACIP's members "without undertaking any of the rigorous screening that had been the hallmark of ACIP member selection for decades" [s1].

Notably, the order does not resolve the case — it grants preliminary relief, meaning the government could still prevail once the full record is developed. Judge Murphy wrote that even if defendants ultimately show the dispute "amounts only to a difference in opinion" about how best to raise vaccination rates, temporarily reverting to the prior approach while the merits are litigated does not impose the kind of burden that would outweigh the public health risks plaintiffs and outside medical groups documented [s1].

What is stayed

The order's remedy has three parts. First, it stays the January 2026 memo revising the CDC's childhood immunization schedule under 5 U.S.C. § 705, the Administrative Procedure Act provision courts use to pause agency action pending review [s1]. Second, it stays the appointments of the thirteen ACIP members named on three separate dates — 11 June 2025, 11 September 2025, and 13 January 2026 [s1]. Third, it stays every vote that committee took, on the reasoning that a committee likely violating federal advisory-committee law shouldn't have its actions carry legal weight in the meantime [s1].

The court explicitly declined to go further than that. Plaintiffs had asked the judge to enjoin ACIP from meeting at all and to set aside specific prior votes as a separate remedy; the court found a stay — "less drastic" than an injunction — was the appropriate tool, and left it to HHS to reconstitute a lawful committee if it chooses [s1]. The practical effect, the order notes, is the same either way: "while the appointments of the challenged members of ACIP are stayed, ACIP as currently constituted cannot meet, for how can a committee meet without nearly the entirety of its membership?" [s1]

That question was not hypothetical. ACIP's meeting had already been rescheduled once, from 25–26 February to 18–19 March, according to a Federal Register notice the court cites in its opinion [s1]. With thirteen of the panel's members now stayed, that meeting cannot proceed as an official federal advisory committee session; members may still gather informally, but any such meeting would carry none of ACIP's statutory authority [s3].

What reverts, and what it means for coverage

Because the stay reaches the January memo as a whole, the practical effect is to restore the schedule recommendations that memo had changed — including the reduction from 17 recommended childhood vaccines to 11, the removal of the hepatitis B birth-dose recommendation, and the downgrade of COVID-19 vaccination to a shared clinical decision rather than a routine recommendation [s2]. Those are the same changes this outlet covered when CDC issued them in January; the March order does not alter what the memo said, only whether it is currently in effect.

American College of Physicians president Jason M. Goldman, MD, MACP, called the ruling "a win for public health" that "reaffirms that national vaccine policy should be guided by rigorous, evidence-based science, not politics" [s2]. The order does not include any on-the-record response from HHS or CDC; the government's position in the litigation, as characterized in the opinion, was that its changes were intended to increase, not restrict, vaccine uptake [s1].

What to watch

The ruling is preliminary, not final — the underlying case over whether the January memo and the ACIP reconstitution comply with federal law is still being litigated, and the government retains its normal appellate options against a preliminary injunction of this kind. For now, the schedule pediatricians and other clinicians are expected to follow has reverted to its pre-January form, the seats of thirteen ACIP members are vacant as a legal matter, and the committee that has shaped U.S. vaccine recommendations for six decades cannot officially convene until HHS either appoints a committee the court finds lawfully balanced or prevails on appeal. Which of those happens first is the question the rest of this case will answer.

Sources

• American Academy of Pediatrics, et al. v. Robert F. Kennedy, Jr., et al. — Memorandum and Order on Plaintiffs' Motion for Preliminary Injunction — U.S. District Court for the District of Massachusetts, 16 March 2026
• Federal Judge Blocks Immunization Schedule Changes, Stays ACIP Member Appointments — American College of Physicians, 16 March 2026
• The State of US Vaccine Policy: Special Edition — CIDRAP, University of Minnesota, 17 March 2026