A federal court has temporarily blocked a new vaccine guideline that could have led to fewer vaccinations for American children. The ruling by Judge Brian E. Murphy comes in response to Health Secretary Robert F. Kennedy Jr.'s modifications that have alarmed medical groups. These changes included a proposal to no longer recommend vaccines for flu, hepatitis, and RSV, among others, jeopardizing public health. Critics argue that the reconstituted Advisory Committee on Immunization Practices (ACIP), now filled with anti-vaccine voices, may not adhere to federal protocols, prompting the judge to intervene. Medical associations are advised that the future of children's health against various diseases hangs in the balance.