In an announcement on X, Kennedy, a vaccine sceptic, said reconstituting the Advisory Committee on Immunization Practices (Acip) was a "major step towards restoring public trust in vaccines". Kennedy said the new members "have each committed to demanding definitive safety and efficacy data before making any new vaccine recommendations.

America's vaccine policy has been set for decades, with patients, providers, scientists and insurers more or less in sync on the merits of immunizations. In the last several weeks, Health Secretary Robert F.