ACIP is a federal advisory committee chartered under the Federal Advisory Committee Act and 42 U.S.C. 217a. Its members -- usually 15 voting experts in immunology, pediatrics, infectious disease, and public health -- vote on which vaccines to recommend for which populations. The CDC director typically adopts ACIP votes as the official U.S. recommendation, after which insurers must cover the vaccine without cost-sharing under the Affordable Care Act.
The committee was established in 1964 to give the Public Health Service standing expert input. The Federal Advisory Committee Act of 1972 imposed public meetings, written records, and balanced-membership requirements. In June 2025, HHS Secretary Kennedy dismissed all 17 ACIP members and replaced them with vaccine skeptics, breaking a written pledge to Senator Bill Cassidy and provoking the August 2025 firing of CDC Director Susan Monarez when she refused to rubber-stamp the new committee votes.
ACIP recommendations are technically non-binding -- the CDC director can decline to adopt them and HHS can override them -- but the routinized practice over 60 years has made ACIP votes the de facto floor for federal vaccine policy.
When ACIP gets captured, every downstream actor -- pediatricians, schools, insurers -- has to decide whether to follow CDC guidance or build alternatives. The American Academy of Pediatrics breaking from CDC in September 2025 was a direct response.
People often think ACIP is just an advisory body and the CDC director decides alone. In practice, ACIP votes drive ACA insurance coverage and state school mandates almost automatically.
When ACIP gets captured, every downstream actor -- pediatricians, schools, insurers -- has to decide whether to follow CDC guidance or build alternatives. The American Academy of Pediatrics breaking from CDC in September 2025 was a direct response.
People often think ACIP is just an advisory body and the CDC director decides alone. In practice, ACIP votes drive ACA insurance coverage and state school mandates almost automatically.