Overview
- State data show 903 confirmed measles cases across 39 counties as of Monday, Sept. 28, with Lancaster County the hardest hit at 363 cases.
- The Pennsylvania Department of Health reports 176 hospitalizations, raising pressure on isolation capacity and care for infants and other vulnerable patients.
- The state has reported four measles‑associated deaths while the CDC is reviewing death‑classification rules and currently lists one verified U.S. measles death, creating a public federal‑state dispute over attribution.
- Health officials have run hundreds of pop‑up clinics and state teams have administered thousands of MMR doses in 2026, but pockets of low vaccination and lower routine MMR uptake are sustaining transmission.
- Nationally the U.S. has recorded roughly 3,659 measles cases in 2026 and public‑health guidance remains that two doses of MMR give about 97% protection and are the best defense for communities.