Trump Signs Order to Split MMR Shot and Space Out Vaccines as Maryland Declares New Measles Outbreak

President Trump signed an executive order Monday directing federal health officials to overhaul the childhood vaccine schedule, cutting the recommended number of shots from 17 to 11 and splitting the combined measles-mumps-rubella (MMR) vaccine into three separate injections given at separate doctor visits, according to a White House fact sheet cited by the Associated Press and NPR.

There's a practical problem right out of the gate: separate measles, mumps, and rubella vaccines are not currently available in the United States, according to the Associated Press. The order directs the health department to improve vaccine research, but it doesn't manufacture a product that doesn't exist.

Trump's autism claim, and what the evidence actually shows

During the Oval Office signing, Trump said, "I came in, and I said, I want to find what's going on with autism. It's many, many times what it used to be years ago. And it gets progressively worse, and we add progressively more and more vaccines," according to NPR. He also claimed children currently receive vaccine doses the size of "vats," which NPR and CNN both reported is a significant overstatement of the actual volume administered.

That autism link isn't new, and it isn't supported. CNN's fact check cites Dr. Sean O'Leary of the University of Colorado Denver, who says more than 40 studies across seven countries and 5.6 million people have found no connection between vaccines and autism, calling it "settled science." Dr. Alycia Halladay of the Autism Science Foundation pointed to national-level data from Denmark, Sweden, Finland, Israel, and Japan showing the same result. Dr. Aaron Milstone of Johns Hopkins, speaking for the American Academy of Pediatrics, told reporters Monday, "There's no new science. All the data say that there's no association between vaccines and autism."

Autism diagnoses have genuinely risen sharply over the past few decades, and parents watching that trend want a cause and a fix. But researchers attribute the rise mainly to broader diagnostic criteria, more awareness, and expanded screening, not vaccines, and NPR notes Trump "wildly understated the prevalence of autism 20 years ago," meaning even his premise about the scale of the increase is shaky.

Not everyone in the room Monday was skeptical. Brian Hooker, chief scientific officer at Children's Health Defense, told NPR he was "very, very encouraged" by the order, saying "too many vaccines are given too soon." That view remains outside mainstream pediatric consensus, but it reflects a real constituency the administration is responding to.

Measles outbreak grows in Maryland the same week

While Trump was signing the order, the Maryland Department of Health announced outbreak declarations in St. Mary's, Carroll, and Cecil Counties, according to Newsweek. The state has confirmed 31 measles cases this year, with 27 of them, all among unvaccinated residents, reported since July 15. St. Mary's County has 13 cases, Carroll has eight, Cecil has five, and Charles County has one.

Maryland Health Secretary Dr. Meena Seshamani said in a statement that "the overall risk remains low if you are fully vaccinated," and the department said there's no evidence of widespread community transmission since most infections have spread among household contacts. Officials are working with local health departments to boost vaccination access in affected areas.

Maryland's outbreak is a local snapshot of a national trend. Federal data posted Monday and reported by MedPage Today show kindergarten MMR vaccination fell to 92.4% for the 2025-26 school year, down from the year before and well below the 95% threshold considered necessary to prevent outbreaks. Vaccine exemptions hit a record 4.2% nationally, up from 3.6% the prior year, the fourth straight year exemptions have set a new high. That's roughly 155,000 kindergarteners nationally with an exemption on file, per the CDC data cited by MedPage Today.

Dr. James Campbell of the American Academy of Pediatrics told MedPage Today, "The root cause of this is primarily because there's so much chaos and confusion in vaccination recommendation systems in the last year or so." He estimated more than a quarter-million entering kindergartners nationally are currently susceptible to measles.

What's actually contested and what isn't

The science on vaccines and autism isn't a close call. Decades of large studies across multiple countries have consistently found no link, and no new data presented Monday changed that. Trump's claims about vaccine dose size and autism prevalence trends were also directly contradicted by pediatric researchers on the record.

What is legitimately contested is whether an administration under legal and political pressure can actually implement this order. NPR reports legal experts already question whether it holds up any better than Trump's earlier vaccine directives, which a federal judge in Boston previously blocked. Health authorities have also warned that spacing out shots, as this order recommends, leaves an added window where a child is vulnerable to a disease the vaccine would have already prevented.

The open question now is whether this order faces the same legal fate as its predecessor, and whether the Health and Human Services Department under Secretary Robert F. Kennedy Jr., who MedPage Today notes was a leading vaccine-skeptic voice before joining the administration, moves to implement changes before any court intervenes.