President Donald Trump on Monday signed an executive order directing the Department of Health and Human Services to reduce the number of recommended childhood vaccines from the current schedule to 11 shots, while calling for the measles, mumps and rubella (MMR) vaccine to be split into three separate doses administered over multiple visits.
The order also directs the Department of Justice to investigate state compliance with childhood vaccine mandates, including exemptions for medical, religious, or disability-related reasons. Secretary of Health and Human Services Robert F. Kennedy Jr. attended the signing, reinforcing the administration’s alignment with vaccine-skeptical positions.
During a briefing, Trump repeatedly linked childhood vaccines to autism, stating that rising vaccination rates coincided with increased autism diagnoses. He claimed the updated recommendations would align the U.S. with "other advanced nations" and "common sense." The order requires HHS to reassess vaccine sequencing and timing within 90 days, with a draft obtained by CBS News indicating a goal of spreading out vaccines over a year and a half instead of administering them in concentrated schedules.
Scientific consensus and policy response
Decades of research have found no evidence linking vaccines to autism, including studies by the National Institutes of Health (NIH) and the Centers for Disease Control and Prevention (CDC). The NIH notes that genetics and prenatal factors are considered potential risk factors for autism, while the CDC states that vaccines undergo rigorous safety testing. The American Academy of Pediatrics and other medical organizations have condemned the order, emphasizing that vaccine schedules are designed to maximize protection while minimizing risks.
The executive order follows prior administration efforts to weaken recommendations for the MMR-varicella (MMRV) vaccine, which protects against chickenpox, last year. Kennedy Jr., a prominent vaccine skeptic, has long argued for reduced vaccination schedules, citing concerns about vaccine safety despite lacking peer-reviewed evidence.
Implementation and legal implications
The order directs HHS to reassess vaccine recommendations and timing, with a focus on flexibility in scheduling. It also mandates the DOJ to examine state vaccine mandates, particularly regarding exemptions. Legal experts note that vaccine mandates have historically faced challenges but have been upheld by courts as constitutional when balanced against public health needs.
Kennedy Jr. has previously suggested that combination vaccines increase risks, a claim contradicted by federal health agencies. The administration’s push to split the MMR vaccine into separate doses has drawn criticism from infectious disease specialists, who warn that delaying or fragmenting doses could reduce efficacy and increase disease transmission risks.
Public health and political reactions
Public health advocates warn the order could undermine herd immunity, particularly for measles and other preventable diseases. The Infectious Diseases Society of America stated that altering vaccine schedules without evidence-based justification poses unnecessary risks. Meanwhile, supporters of the order argue it prioritizes parental choice and aligns with international practices, though no major developed nation has adopted such a restrictive schedule.
The White House framed the action as part of an effort to establish "the best vaccine recommendations in the entire world," though no comparative data was provided to support claims of U.S. vaccines being inferior. The order does not immediately alter existing state mandates but sets the stage for potential legal and policy conflicts between federal recommendations and local enforcement.