March 17, 2026
A Massachusetts judge on Monday sided with several medical organizations and temporarily blocked parts of Health and Human Services Secretary Robert F. Kennedy Jr.’s changes to federal vaccine policy. The ruling halts implementation of multiple directives issued by Kennedy that medical groups said would undermine long-standing vaccination practices for children.
The plaintiff organizations argued that the policy shifts—from alterations to federal guidance on childhood immunizations to changes affecting school-entry requirements and vaccine reporting—exceeded the secretary’s statutory authority and posed a risk to public health by reducing vaccination coverage and complicating providers’ obligations. They asked the court for emergency relief, saying immediate harm to pediatric vaccination programs and to children’s health outcomes would result if the policies took effect.
In granting the temporary halt, the judge found the plaintiffs showed a likelihood of success on key legal claims and that they would suffer irreparable harm absent an injunction. The court’s order pauses enforcement of the specified provisions while litigation proceeds, but it is not a final determination on the merits.
HHS, led by Kennedy, defended the policy changes as lawful exercises of regulatory authority intended to increase transparency and parental involvement in vaccination decisions. The department indicated it will review the order and consider an appeal.
The decision leaves in place existing vaccine policies for now and sets the stage for further briefing and a fuller hearing on the legality and public-health implications of the secretary’s actions. Both sides can seek expedited consideration as the case moves through the federal court system.