Overview
- The president signed an executive order directing HHS to unbundle the combined MMR shot into three single-disease injections and to narrow routine childhood vaccine recommendations.
- Sen. Bill Cassidy, a physician and key GOP figure who helped confirm HHS Secretary Robert F. Kennedy Jr., publicly called the president’s remarks and the policy 'a crazy, stupid thing' and warned it would raise costs and burden families with more clinic visits.
- Major medical and public-health experts say decades of research show no link between vaccines and autism and see no clinical reason to split the MMR, arguing the move could reduce vaccination completion and raise outbreak risk.
- Practical and regulatory barriers mean splitting MMR would likely take years because no single-antigen MMR products are licensed in the United States and new clinical trials, FDA approvals, and expanded manufacturing would be required.
- The order has prompted political pushback within the GOP and plans for state resistance and legal challenges, and officials have signaled they will not immediately change school-entry vaccine rules in response.