Pennsylvania’s 2026 measles count reached 792 on Monday after the state recorded nearly 100 additional cases in one week, extending the nation’s largest active outbreak as health officials seek more federal assistance. The state has also reported four measles-associated deaths and is pursuing a Centers for Disease Control and Prevention field investigation.
The latest total was reported by state officials through the Department of Health’s measles dashboard and confirmed by The Philadelphia Inquirer. Lancaster County remains the center of the outbreak, while cases have spread across much of the commonwealth. The state’s count is more current than the CDC’s weekly national data, which explicitly directs readers to Pennsylvania for real-time updates.
On Sept. 15, the Health Department announced its third and fourth associated deaths after investigations with county coroners. The state said its classification required clinical evidence, a positive laboratory test and a determination that an unrelated cause did not explain the death. Two earlier deaths were reported in Lancaster County in August. All four remain absent from the CDC’s national measles death count, producing a public dispute over reporting standards rather than the state’s confirmed case total.
Health Secretary Debra Bogen outlined Pennsylvania’s request for CDC help in a Sept. 16 letter. She said the state had begun seeking an Epi-Aid team, a short-term federal deployment that supplies epidemiologic and technical support during urgent public-health investigations. Bogen also said she would withdraw the request if the CDC could not publicly communicate the four state-identified deaths accurately. Reuters reported the request and the disagreement the following day.
The letter documents the scale of Pennsylvania’s response. State staff had administered more than 4,400 MMR vaccinations at 140 pop-up clinics in affected communities and more than 6,800 doses statewide during 2026. Providers reported nearly 47,000 MMR vaccinations to the state registry in August, which Bogen called a monthly record. Dozens of additional clinics were planned, including free vaccinations at the Bloomsburg Fair from Sept. 26 through Oct. 3.
The outbreak is part of a broader national resurgence. The CDC reported 3,471 confirmed U.S. cases as of Sept. 17, with 95% linked to 39 outbreaks. The agency notes that states have the most up-to-date local figures. Pennsylvania’s outbreak alone now represents nearly one-quarter of that national count, although the two totals reflect different reporting dates.
For residents, the immediate guidance is unchanged. Pennsylvania says two MMR doses provide the best protection and are widely available through pediatric and primary-care offices, pharmacies, local health departments and 59 state health centers. Anyone who believes they were exposed and develops fever, cough, runny nose, red eyes or a spreading rash should contact a clinician before arriving for care so staff can limit further exposure.
