The Pennsylvania measles death toll rose after a 40-year-old woman in Jefferson County died from complications associated with the disease.
The Jefferson County coroner’s office reported that the woman died Saturday. The office said it is working with the Pennsylvania Department of Health on the case.
Coroner Greg Furlong described the death as a heartbreaking loss. He also warned that measles can become a serious and potentially life-threatening illness.
The state health department is conducting its own review. Officials will use the state’s epidemiological criteria for a measles-associated death.
The department shared those criteria with the CDC and the Council of State and Territorial Epidemiologists on September 10.
Pennsylvania Reports Hundreds of Cases
Pennsylvania has faced a major measles outbreak during 2026.
State health officials reported 676 confirmed cases and 124 measles-related hospitalizations as of Friday. The number later rose to 693 cases across 38 counties by September 10, according to state data cited by Reuters.
The latest Jefferson County death adds to concerns about the severity of the outbreak.
Health officials classify a death as measles-associated when a person has an active measles infection and meets specific clinical and laboratory criteria. The review also considers whether another cause explains the death.
That process can take time because measles can trigger complications that ultimately cause death.
Vaccination Rates Remain a Concern
Measles spreads easily among people who lack immunity.
Public health experts generally say vaccination coverage of about 95% can help prevent outbreaks through community protection. Two doses of the measles, mumps and rubella vaccine provide about 97% protection against measles.
Pennsylvania’s kindergarten vaccination rate has declined slightly.
State data for the 2025-26 school year showed that 93.2% of kindergarten-age children had received the required two MMR doses. That compared with 93.7% during the previous school year.
The rate was lower in Lancaster County. There, 87.6% of kindergarten students had received both required doses.
Health Officials Monitor Low-Vaccination Communities
Public health officials have called for greater attention to communities with lower measles vaccination rates.
Moss said health agencies need to identify areas where vaccination coverage remains low. She also pointed to misinformation and distrust as factors affecting vaccine uptake.
Meanwhile, the United States is experiencing its largest annual measles outbreak in decades.
By September 10, the country had recorded 3,294 confirmed measles cases in 2026, according to CDC data cited by Reuters. Pennsylvania accounted for 693 of those cases.
Measles Outbreak Continues
The Pennsylvania outbreak comes as health officials monitor measles activity across the country.
The disease can cause fever, rash and respiratory symptoms. It can also lead to serious complications, particularly among people who lack immunity.
The MMR vaccine remains the main tool for preventing measles infection.
For Pennsylvania, the latest death has added urgency to the state’s response. Health officials will continue reviewing the Jefferson County case while monitoring new infections across the commonwealth.
As the outbreak continues, vaccination coverage and early detection remain central to efforts to limit further spread.
