Overhaul of Childhood Vaccine Guidance Blocked by Federal Judge in Massachusetts

This is a breaking news story. Coverage is ongoing.

A federal judge in the US District Court of Massachusetts has issued a stay against Health and Human Services (HHS) Secretary Robert F. Kennedy Jr, temporarily blocking portions of the HHS overhaul of childhood vaccination guidance, according to a brief released by Judge Brian E. Murphy on March 16, 2026, and a statement from the American Academy of Pediatrics (AAP).^1,2

The actions stem from a lawsuit filed against Kennedy and HHS by AAP and other leading medical societies. Murphy granted the motion for preliminary relief to the plaintiffs, staying the January 2026 decision from HHS to dramatically scale back the number of immunizations recommended for children in the United States.^1,3,4

Murphy also stayed the reconstitution of the Advisory Committee on Immunization Practices (ACIP), as well as all votes taken by the now-stayed ACIP since its reconstitution on June 11, 2025. Votes that have taken place since this period include those to remove thimerosal from influenza vaccines; to add restrictions on the use of the measles-mumps-rubella-varicella and hepatitis B virus vaccines; and to remove the universal recommendation for COVID-19 vaccination.^1,5-8

“Today’s ruling is a historic and welcome outcome for children, communities, and pediatricians everywhere,” Andrew Racine, MD, PhD, FAAP, president of the AAP, said in a news release published after the ruling. “This decision effectively means that a science-based process for developing immunization recommendations is not to be trifled with and represents a critical step to restoring scientific decision-making to federal vaccine policy that has kept children healthy for years.”²

Murphy wrote that the government “bypassed ACIP to change the immunization schedules,” calling the action not only a “procedural failure” but “an abandonment of the technical knowledge and expertise embodied by that committee.” He continued, determining that the removal of “duly appointed members of ACIP” and the summary replacement of them “highlights the very reasons why procedures exist and raises a substantial likelihood that the newly appointed ACIP fails to comport with governing law.”¹

Ultimately, he decreed that the reconstitution of ACIP and the January 2026 alterations to the childhood vaccine schedule likely violated the Administrative Procedure Act, a core piece of federal law that governs how administrative agencies make rules.^1,9

REFERENCES

1. American Academy of Pediatrics v Robert F. Kennedy Jr. US District Court, District of Massachusetts. Case 1:25-cv-11916-BEM; document 291. Filed March 16, 2026. Accessed March 16, 2026. https://litigationtracker.law.georgetown.edu/wp-content/uploads/2025/07/American-Academy-of-Pediatrics_2026.03.16_ORDER-ON-MOTION-FOR-PRELIMINARY-INJUNCTION.pdf

2. Racine A. AAP statement on historic ruling in vaccine lawsuit. News release. American Academy of Pediatrics. March 16, 2026. Accessed March 16, 2026. https://www.aap.org/en/news-room/news-releases/aap/2026/aap-statement-on-historic-ruling-in-vaccine-lawsuit/

3. Halpern L. Medical societies sue HHS, Secretary Kennedy over changes in COVID-19 vaccine guidance. Pharmacy Times. July 8, 2025. Accessed March 16, 2026. https://www.pharmacytimes.com/view/medical-societies-sue-hhs-secretary-kennedy-over-changes-in-covid-19-vaccine-guidance

4. McGovern G. Federal health officials scale back number of recommended vaccines for children. Pharmacy Times. January 5, 2026. Accessed March 16, 2026. https://www.pharmacytimes.com/view/federal-health-officials-scale-back-number-of-recommended-vaccines-for-children

5. Halpern L. Department of Health and Human Services reconstitutes ACIP, removing 17 sitting members. Pharmacy Times. June 10, 2025. Updated June 12, 2025. Accessed March 16, 2026. https://www.pharmacytimes.com/view/department-of-health-and-human-services-reconstitutes-acip-removing-17-sitting-members

6. Halpern L. ACIP recommends adults receive seasonal, single-dose influenza vaccines free of thimerosal. Pharmacy Times. June 26, 2025. Accessed March 16, 2026. https://www.pharmacytimes.com/view/acip-recommends-adults-receive-seasonal-single-dose-influenza-vaccines-free-of-thimerosal

7. Halpern L. ACIP meeting: combined MMRV vaccine, hepatitis B vaccine restricted for some age groups. Pharmacy Times. September 19, 2025. Accessed March 16, 2026. https://www.pharmacytimes.com/view/acip-meeting-combined-mmrv-vaccine-hepatitis-b-vaccine-restricted-for-some-age-groups

8. Halpern L. ACIP meeting: COVID-19 vaccines to be administered through shared clinical decision-making. Pharmacy Times. September 19, 2025. Accessed March 16, 2026. https://www.pharmacytimes.com/view/acip-meeting-covid-19-vaccines-to-be-administered-through-shared-clinical-decision-making

9. Administrative Procedure Act. Cornell Law School. Updated February 2025. Accessed March 16, 2026. https://www.law.cornell.edu/wex/administrative_procedure_act