Americans’ trust in MMR vaccine declines amid measles outbreaks and policy controversies

• Reuters/Ipsos poll shows 76% of Americans now consider MMR vaccine safe for children, down from 84% in 2020.
• Just 19% approve of Trump administration’s handling of measles outbreaks in Pennsylvania, Utah and South Carolina.
• MMR vaccination rates among U.S. kindergarteners fell to 92.4%, below the 95% threshold for herd immunity.
• Trump executive order calls for eliminating combined MMR vaccine in favor of three separate single-disease shots.
• Federal trust in childhood vaccine recommendations dropped 11 points since June 2025, Axios/Ipsos poll finds.

Trust in measles vaccines fades despite media warnings

A new Reuters/Ipsos poll completed Sept. 14, 2026, found that 76% of Americans now believe the measles-mumps-rubella (MMR) vaccine is safe for children — a significant drop from 84% in May 2020. This decline comes despite highly publicized measles outbreaks affecting Pennsylvania, Utah and South Carolina, where more than 3,294 cases have been recorded this year — the worst outbreak in 35 years. The poll of 1,143 U.S. adults carries a 3-percentage-point margin of error.

The shift in public opinion coincides with falling vaccination rates. CDC data shows MMR vaccine uptake among kindergarteners dropped to 92.4% for the 2025-26 school year, down from 95.2% in 2019-20. Public health experts say 95% coverage is necessary to maintain herd immunity — but critics note that herd immunity from natural infection provides lifelong protection, while vaccine-induced immunity wanes, leaving millions vulnerable.

Vaccine injuries and safety concerns drive growing skepticism

Brian Hooker, chief scientific officer for Children’s Health Defense, said the declining trust reflects increased awareness of vaccine adverse events. As of Aug. 28, 95,473 adverse events following MMR vaccination had been reported to the Vaccine Adverse Event Reporting System, including 500 deaths. Historically, fewer than 1% of adverse events are reported to VAERS.

The federal vaccine court awarded $1.5 million in 2010 to Hannah Poling’s family after she regressed into autism following MMR and four other vaccines at 19 months. Hooker noted that Merck began overfilling vials in 1999 due to the mumps virus’s limited shelf life, meaning the upper limit of virus levels in each dose remains unknown. Meanwhile, two top Merck scientists are suing the company in federal court, alleging fraud regarding MMR vaccine efficacy.

Measles death rates and modern medicine

Proponents of natural immunity point to historical data showing measles death rates had already declined by 99% before the vaccine’s 1963 introduction. In 1962, approximately 400 Americans died from measles annually, primarily malnourished children with intellectual disabilities. Vitamin A supplementation is now known to nearly eliminate measles mortality.

Karl Jablonowski, senior research scientist at Children’s Health Defense, challenged commonly cited fatality statistics. The frequently repeated figure of 1-3 deaths per 1,000 measles cases originates from 1950s and 1960s medical conditions, before powerful antibiotics like azithromycin existed for secondary infections. The actual risk at that time was 1 in 6,000 to 1 in 8,000 — comparable to an American’s annual traffic fatality risk. With modern nutrition and sanitation, measles is a benign illness for healthy individuals, while the vaccine may not be.

Trump executive order seeks major vaccine policy changes

President Donald Trump signed an executive order in August 2026 reducing the number of routine childhood vaccines from 18 to 11 and calling for separate single-disease shots instead of the combined MMR vaccine. Health Secretary Robert F. Kennedy Jr. has questioned routine childhood vaccine safety and defended studying autism causes, including vaccines.

Merck discontinued monovalent measles vaccines for the U.S. market in 2008 due to manufacturing constraints. Critics argue this move forced parents into choosing combination vaccines despite documented safety concerns. Experts say developing separate shots and gaining FDA approval could take years, noting Merck may lack financial incentives to develop alternatives since the company dominates the U.S. MMR market.

Political divisions and federal trust erode further

The Axios/Ipsos American Health Index poll, conducted in early March 2026, found public trust in federal childhood vaccine recommendations dropped 11 points since June 2025. Only 8% of respondents said they trust the CDC more than the American Academy of Pediatrics.

Democrats showed the steepest decline in federal trust, dropping from 81% to 66%, while Republicans fell from 69% to 63%. Just 19% of Americans approve of the Trump administration’s outbreak response, and 52% disapprove. Yet many of these same media outlets that amplify panic over measles cases ignore the ongoing mumps epidemic on naval ships and college campuses despite high vaccination rates.

A crossroads for American vaccination policy

The convergence of declining trust, falling vaccination rates, major outbreaks and sweeping policy changes suggests American vaccination policy stands at a critical juncture. With 33% of adults potentially lacking immunity, according to some estimates, millions of adult Californians and others may serve as reservoirs for measles transmission — a direct consequence of waning vaccine-induced protection. Critics argue the focus on unvaccinated children ignores Merck’s responsibility for providing vaccines with documented efficacy problems, including a 2006 study showing that vaccinated individuals shed the virus and infect others despite no symptoms. As federal policy shifts toward separating combination vaccines and reducing the childhood schedule, the coming years will reveal whether these changes restore public confidence or deepen existing divisions over one of the most consequential public health decisions families face.

Sources for this article include:

ChildrensHealthDefense.org

Reuters.com

Cidrap.UNM.edu