HARRISBURG, Pa. — Pennsylvania’s measles outbreak has grown to more than 700 confirmed cases and four associated deaths, the state’s worst in more than three decades.
As of mid-September 2026, health officials reported 693 to 731 cases across dozens of counties, with more than 130 hospitalizations.
The Four Deaths
The deaths include two infants too young to be vaccinated, an unvaccinated 40-year-old woman, and an unvaccinated 18-year-old who died from a rare neurological complication linked to measles. State health officials have classified all four as measles-associated.
Pennsylvania Secretary of Health Dr. Debra Bogen called it the worst outbreak in more than 30 years and urged vaccination with the MMR vaccine.
Context
Most cases have occurred in unvaccinated individuals. The outbreak has drawn national attention and political debate over how measles deaths are counted and reported.
Health officials continue to stress that the two-dose MMR vaccine provides strong protection and remains the most effective way to stop further spread.
Based on Pennsylvania Department of Health updates and reporting through September 16, 2026.
Pennsylvania’s measles outbreak has grown with four associated deaths reported.
— Public health update September 2026
