We are living in truly unprecedented times. On August 10, President Trump signed an executive order aimed at reshaping the nation’s childhood immunization schedule, including directing HHS to pursue separate measles, mumps, and rubella (MMR) vaccines and to administer childhood immunizations at separate appointments whenever possible. The order also directs HHS to conduct further research on vaccines, despite decades of high-quality evidence demonstrating that vaccines are safe and effective.
Let’s be clear about what is driving this policy. Throughout the second Trump administration, the president has repeatedly suggested a link between childhood vaccines and autism. The science, however, is unambiguous: decades of research involving millions of children have found no credible association between the MMR vaccine, or childhood vaccines more broadly, and autism.
The disinformation coming from the Trump administration amounts to a dangerous experiment on our children. Americans deserve better than political ideology masquerading as medical science. They deserve to know that Trump and HHS Secretary Robert F. Kennedy Jr. are sowing doubt about vaccines despite the overwhelming evidence supporting their safety and effectiveness.
The predictable result will be more vaccine hesitancy, more vaccine refusal, and more opportunities for preventable diseases to return. And it will fall on us, as pediatricians, infectious disease doctors, emergency physicians, and intensive care experts, to navigate the fallout.
We already know what that looks like. South Carolina just experienced its largest measles outbreak since the disease was eliminated in the U.S. in 2000: 997 cases were reported statewide, with the overwhelming majority concentrated in Spartanburg County. At the national level, the country has recorded more measles cases than in any other year since 1991, and we’re only halfway through 2026.
This is not theoretical. I have spent 15 years caring for South Carolina’s sick and injured children, and I have seen what happens when preventable diseases become very real. That is precisely why we need healthcare professionals in the rooms where public health decisions are made.
The current American Academy of Pediatrics childhood immunization schedule is not some arbitrary list dreamed up in a bureaucratic conference room. It is built on decades of evidence about when children are most vulnerable to serious infections, when vaccines generate the strongest immune response, and which vaccines have been demonstrated to be safe and effective when administered together.
Science evolves. Of course it does. That is a feature of science, not a flaw.
But this executive order was not driven by some groundbreaking new discovery that suddenly invalidated decades of pediatric research. It was driven by politics and misinformation. Any proposed changes to the childhood immunization schedule should be based on rigorous scientific evidence and expert review — not on how a politician feels about vaccines.
The proposal to split the MMR vaccine is a particularly glaring example. There are currently no licensed single-antigen measles, mumps, or rubella vaccines available in the U.S., meaning the recommendation is not even immediately feasible. And there is no evidence that separating the vaccines offers a safety benefit compared with the combined MMR vaccine, which has been extensively studied and safely administered for decades.
Then there is the practical reality.
Requiring children to return for additional appointments means more time away from work and school for parents and kids, more strain on already-busy pediatric practices, and more opportunities for children to fall behind on immunizations. Every additional hurdle makes it easier for a child to remain unprotected — and harder for families to keep up. In other words, we are taking something that works and making it harder to do.
As a pediatrician, I have seen the consequences of anti-vaccine conspiracy theories firsthand. I’ve put a spinal needle into a toddler’s back and watched purulent fluid drip into a test tube. I’ve intubated an infant struggling with apnea from whooping cough. I’ve watched premature infants fight for every breath against overwhelming respiratory syncytial virus infections.
Those are not abstract policy debates. Those are children. And the lesson could hardly be clearer: when vaccination rates fall, preventable diseases come back.
Just as a physician can lose their license when medical malpractice is discovered, elected officials must be held accountable when the policies they implement put the public at risk.
Trump calls this executive order a “major victory for parents rights, religious and constitutional rights, and for the gold standard science.” From my vantage point, there is nothing gold-standard about ignoring decades of evidence, creating unnecessary barriers to vaccination, and undermining public trust in medicine.
From where I stand, the children are the ones who stand to lose. And ultimately, doctors will have to bear witness to their suffering.
