Tensions mounted at the U.S. Centers for Disease Control and Prevention (CDC) as Secretary of Health and Human Services Robert F. Kennedy Jr. restructured the Advisory Committee on Immunization Practices (ACIP), replacing its members with individuals lacking relevant expertise and holding anti-vaccine views. The reconstituted panel voted to remove the MMRV vaccine recommendation for young children and considered delaying the newborn hepatitis B shot. Former CDC director Susan Monarez and other officials resigned in protest, testifying before the Senate about political interference and erosion of scientific integrity. These developments have raised alarms about the impact on vaccine coverage and potential resurgence of preventable diseases.