A federal judge in Massachusetts stayed votes taken by Health and Human Services Secretary Robert F. Kennedy Jr.’s reconstituted Advisory Committee on Immunization Practices (ACIP), paused the appointments of 13 members and enjoined the CDC’s revised childhood vaccine schedule. The ruling, issued by Judge Brian Murphy in American Academy of Pediatrics v. Kennedy, blocks a planned ACIP meeting and the CDC’s move to reduce routine vaccine recommendations from 17 to 11 diseases. Medical groups including the American Academy of Pediatrics had sued, arguing the appointments and schedule change violated federal law and public‑health standards; the government may appeal. The decision immediately interrupts rulemaking and delays any near‑term ACIP recommendations on COVID‑19, long‑COVID and vaccine‑injury topics that had been on the agenda.