Key Takeaways
- Pennsylvania reported 890 confirmed measles cases across 39 counties as of September 25.
- The state reported increased MMR vaccination activity as health officials respond to continued transmission.
- CDC data showed 3,659 confirmed measles cases across the United States through September 24.
Pennsylvania Measles Cases Near 900 as Outbreak Continues Across State
Pennsylvania's measles outbreak has continued expanding across the state, with the Pennsylvania Department of Health reporting 890 confirmed cases across 39 counties as of September 25, 2026. The latest official update highlights continued transmission and increased vaccination activity.
Pennsylvania Reports 890 Confirmed Cases
The Pennsylvania Department of Health said 55 new positive cases had been identified since its previous September 23 update.
The total reached 890 confirmed cases across 39 counties by September 25. The department said its measles dashboard continues to provide updated information on cases, hospitalizations, deaths and community transmission.
The outbreak has prompted an expanded public-health response as officials work with healthcare providers and communities to increase access to vaccination and provide information about measles prevention.
Vaccination Activity Increases
The state has seen a substantial increase in demand for the measles, mumps and rubella vaccine.
Pennsylvania health care providers normally administer approximately 25,000 MMR doses during a typical month. In August, more than 49,000 MMR vaccines were administered across the Commonwealth.
During the first three weeks of September, more than 38,000 additional MMR doses were administered.
The Pennsylvania Department of Health says two doses of the MMR vaccine provide 97% protection against measles. People with two documented doses generally do not need another dose, while individuals with incomplete or uncertain vaccination records are advised to discuss their situation with a healthcare provider or pharmacist.
Measles Remains Highly Contagious
Measles spreads when an infected person breathes, coughs or sneezes. According to the Pennsylvania Department of Health, the virus can remain infectious in the air and on surfaces for up to two hours after an infected person leaves an area.
Initial symptoms can include fever, cough, runny nose and red, watery eyes. A rash typically develops later, beginning on the head and moving downward across the body.
The department says symptoms can begin seven to 21 days after exposure. Measles can also cause serious complications, including pneumonia and brain swelling.
National Cases Continue to Rise
The Pennsylvania outbreak is part of a broader measles resurgence in the United States.
CDC data updated September 25 showed 3,659 confirmed measles cases had been reported nationally as of September 24, with cases reported across 47 jurisdictions.
Pennsylvania was among the jurisdictions contributing to the national total, underscoring the scale of measles transmission across the country during 2026.
TwikUp's Perspective
The latest Pennsylvania figures show why outbreak monitoring cannot rely only on the headline case count. Vaccination activity, hospitalizations, geographic spread and community transmission all provide additional context for understanding the public-health situation.
The sharp increase in MMR administration also represents a measurable response to the outbreak. Pennsylvania's reported vaccination figures indicate that residents and healthcare providers have responded with increased demand for protection.
For readers tracking the outbreak, the Pennsylvania Department of Health's dashboard remains the most direct source for updated state-level information, while the CDC provides the national picture. Because case and hospitalization figures can change as reports are processed, official dashboards should be checked for the latest totals.