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Pennsylvania recorded its fifth measles-associated death — an unvaccinated Lancaster County resident — as the U.S. endures its worst measles year since 1991. The state now has 943 cases across 39 counties, and all five deaths involved unvaccinated individuals. The U.S. has seen eight measles-associated deaths in just two years — more than the combined total of the previous three decades.
Pennsylvania has recorded its fifth measles-associated death of 2026 — an unvaccinated Lancaster County resident — as the state's outbreak swells to 943 cases across 39 counties. All five deaths involved unvaccinated individuals; two were infants too young to be vaccinated per current guidelines. These are the first measles deaths in Pennsylvania in 35 years, and the nation has now seen eight measles-associated deaths in just two years — more than the combined total from the previous three decades.
The crisis is unfolding against a backdrop of falling vaccination rates and political friction. The CDC and Pennsylvania are at odds over how to count measles deaths, with the CDC listing only two confirmed deaths nationally while the state reports five. Meanwhile, the Trump administration — including HHS Secretary RFK Jr. — has publicly questioned vaccine safety and defunded local vaccination efforts, contributing to a drop in MMR coverage below the 95% threshold needed for herd immunity. In November, international health officials will review whether the U.S. has lost its measles-free status, declared in 2000.
By the Numbers:
Why it matters: The resurgence of measles deaths — from a disease declared eliminated in the U.S. in 2000 — signals a dangerous erosion of herd immunity driven by vaccine hesitancy, misinformation, and policy decisions. With the U.S. elimination status under review and cases at a 35-year high, the public health stakes couldn't be higher.
