President Donald Trump has signed an executive order pushing to reform childhood vaccine recommendations, including a move to separate the MMR shot into individual doses, sparking debate over safety, access, and federal versus state authority.
President Donald Trump has signed an executive order pressing ahead with a major rewrite of federal childhood vaccine recommendations, including a push to separate the measles, mumps and rubella jab into individual shots given at different visits. The order, signed on Monday, is the latest step in a campaign the White House has been building since late last year to align United States guidance with what it calls best practice in other developed countries.
According to the order, the administration says the current American schedule includes more childhood doses than peer nations and argues that more of them should be delivered separately, where possible. Trump tied the move to long-running claims about autism, saying the government wanted a “gold standard” schedule and suggesting that vaccine timing should be reconsidered. Medical groups have repeatedly rejected any link between routine childhood vaccination and autism.
The White House had already set this process in motion on December 5, 2025, when Trump signed a memorandum ordering health officials to study vaccine recommendations in other developed countries. A further order on May 29 directed the Centres for Disease Control and Prevention and its immunisation advisers to review a scientific assessment from the Department of Health and Human Services and consider updating the schedule accordingly.
The new order goes further by instructing the Department of Health and Human Services to work on single-vaccine alternatives, beginning with MMR, while keeping combination vaccines available in the meantime. It also calls for a review of vaccine timing, the development of adjuvants other than aluminium, broader safety research and stronger monitoring. The order says federal agencies should take steps to advance the recommendations where allowed by law, while states are urged to review their own school-entry rules.
Public health experts have warned that splitting combined vaccines could complicate access and leave children exposed for longer periods between doses. AP reported that separate MMR shots are not currently available in the United States, meaning the proposal would require new formulations before it could be fully carried out. The order also remains limited by federalism: vaccine mandates for school attendance are still largely set by states, even as Washington seeks to shape the policy debate.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
