A 40-year-old woman in Jefferson County, Pennsylvania, died Saturday from complications linked to measles, becoming the third reported death in the state's ongoing outbreak.

Jefferson County Coroner Greg Furlong confirmed the death Sunday and stated that the woman had not been vaccinated against measles. She had chronic obstructive pulmonary disease, asthma, and relied on supplemental oxygen 24 hours a day. The preliminary death certificate listed the immediate cause as respiratory failure due to suspected measles.

The woman contracted the virus after exposure to a family member who had measles. Testing results are pending from the state laboratory.

This marks the third measles-associated death in Pennsylvania this year. The previous two fatalities occurred in August in Lancaster County and involved infants.

The Pennsylvania Department of Health reported 676 confirmed measles cases across 37 counties as of Friday, with 124 hospitalizations. Fewer than 1 percent of those cases involved individuals who were fully vaccinated.

The outbreak remains concentrated in areas including Lancaster and Mifflin counties. State officials have administered thousands of MMR vaccines in recent months as part of response efforts.

Nationally, the Centers for Disease Control and Prevention has recorded 3,387 measles cases in 2026, the highest in decades, with Pennsylvania and South Carolina accounting for the majority.

Health officials continue to urge vaccination for those eligible while reviewing the latest case.