Pennsylvania officials have reported a fourth measles-associated death this year as the U.S. state faces a surge of infections, with more than 600 cases recorded in 2026.
An 18-year-old died from acute encephalomyelitis, a rare and severe neurological complication associated with measles, according to the Mifflin County Coroner’s Office. Officials said the individual was unvaccinated.
Two other deaths reported in the state involved a 40-year-old woman and two infants. State and local authorities have linked the deaths to measles-related complications, although some details surrounding the infant deaths have been the subject of disagreement among officials.
Most of Pennsylvania’s reported measles cases have been concentrated in Lancaster County, according to the information provided by state authorities.
Measles is highly contagious and can cause serious complications, including encephalitis and immune system-related effects. Vaccination remains the primary method used to prevent infection and transmission.
Health officials generally estimate that about 95% vaccination coverage is needed to maintain herd immunity against measles.
The latest outbreak has also prompted disagreement between Pennsylvania Governor Josh Shapiro and U.S. Health Secretary Robert F. Kennedy Jr. over the reporting and confirmation of measles-related deaths.
The Pennsylvania Department of Health said it conducted investigations with county coroners before confirming the latest deaths. The investigations included clinical evidence, laboratory confirmation of measles infection and assessment of other possible causes of death.
The developments come as U.S. health authorities face renewed concerns over declining vaccination rates and measles outbreaks.

AdvertisementThe Puranic