A University of Maryland study warns that removing Florida’s school-entry MMR requirements could spark the most severe measles epidemic in over a century, as vaccination rates continue to decline nationwide amid rising exemptions and public scepticism.
A new University of Maryland study warns that Florida’s plan to drop its school-entry measles, mumps and rubella mandate could help ignite the biggest measles epidemic in the United States in centuries, at a moment when the virus is already surging nationwide. The warning lands as the country has recorded 3,471 confirmed measles cases this year, with infections reported in 45 states plus Washington, D.C., and New York City, according to the medical report and recent national coverage. Analysts have tied the rebound to slipping vaccination rates and growing exemption levels, undermining the herd immunity that had once pushed measles out of circulation.
The University of Maryland team, writing in work due to appear in the Proceedings of the National Academy of Sciences, built a model based on a 2025 outbreak in Gaines County, Texas, then layered in Florida’s population structure, vaccination coverage and age-based contact patterns. Their finding was stark: even before any repeal, Florida was already below the level needed to prevent sustained spread. If school requirements were removed and vaccination uptake slipped further, the model projected large outbreaks, including a rise in child deaths not seen in the pre-vaccine era.
The study also suggests that child vaccination matters far more than adult vaccination for slowing transmission. Alice Oveson, the paper’s first author, said vaccinating one child is about three times as effective at reducing spread as vaccinating one adult, largely because children tend to have more close contact with one another. She compared the danger to a dry forest filled with kindling: once enough unvaccinated children are present, the conditions are in place for a fast-moving and potentially deadly outbreak.
That concern comes against a broader national backdrop. Axios reported that measles cases in the United States had already climbed to 2,295 by mid-2026, surpassing the total for the previous year and reaching the highest level in 35 years. The same coverage said the resurgence has revived worries that the country could lose its measles elimination status, while the CDC has repeatedly stressed that maintaining high vaccination coverage remains essential to preventing outbreaks and their complications, including pneumonia, encephalitis and death.
Florida’s situation is especially concerning because exemptions are already relatively common. The University of Maryland researchers said exemption requests in the state stand at 5.9%, above the national average of 4.2%, while national kindergarten coverage has slipped below the 95% level generally needed to sustain herd immunity. Experts cited in recent reporting have warned that even small declines in coverage can have outsized effects, and the Maryland authors argue that catch-up vaccination for adults and short-term measures such as masking and isolation can help, but cannot make up for falling childhood MMR uptake.
The researchers say the policy debate also reflects a public confidence problem. Their paper points to survey data showing that a share of parents remain unconvinced that the MMR vaccine is safe or worth the benefits, and some oppose school-entry requirements altogether. Abba Gumel, the study’s co-author, said officials need better ways to reach those families before the disease spreads further, warning that measles is already circulating, vaccination is falling and children are heading back to school.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
