Pennsylvania state health officials report as of September 23, the total of 835 measles cases have been confirmed across 39 counties in Pennsylvania so far in 2026.
Key updates include:
New Positive Cases (since September 21, 2026): 43
Total Counties: 39
Total Cumulative Cases: 835
Total Hospitalizations: 164
Total Confirmed Measles-Associated Deaths: 4
Measles cases among vaccinated individuals: 4 (less than 1% of cases)
Counties reporting the most cases include Lancaster (342), or 41 percent of the total, Mifflin (94) and Chester (78).
The best protection against measles remains getting fully vaccinated. The MMR vaccine, administered over two doses, boosts a person’s immune system and provides 97% lifetime protection. People who have two documented doses of MMR do not need another. Adults who have only one dose, or who cannot find their vaccination records, should talk with a health care provider or pharmacist about getting vaccinated.
Residents interested in getting vaccinated should contact their trusted health care provider.