Pennsylvania Reports First Measles Deaths in 35 Years Amid Widespread Outbreak
Two unvaccinated Pennsylvanians have died from measles, the state's first such deaths in 35 years, as a nationwide outbreak intensifies.
Two people in Pennsylvania have died from measles, marking the first measles-related fatalities in the state in 35 years and the first such deaths in the United States this year. Health officials confirmed that neither individual had been vaccinated against the disease.
The deaths come as the Pennsylvania Department of Health reports an outbreak affecting nearly 400 people across 28 counties. Nationally, the situation is far more severe, with over 2,800 cases recorded in 2026 alone, following roughly 2,000 cases the previous year — a tenfold increase compared to recent annual figures.
Experts point to declining vaccination rates as the primary driver of the resurgence. Matt Ferrari, a professor of biology and director of the Center for Infectious Disease Dynamics at Penn State, described the dynamic bluntly: "There's really only one answer to why measles comes back. And that's because people aren't vaccinated."
Measles is a highly dangerous illness. Approximately 20% of infections require hospitalization, and between one in 300 and one in 1,000 cases prove fatal. The disease can cause severe fever, brain swelling, and neurological complications, and it also weakens the immune system, leaving patients vulnerable to secondary infections like pneumonia and prolonged diarrheal illness.
Ferrari noted that the current outbreak is fueled by clusters of unvaccinated individuals, often concentrated in communities with religious or ideological exemptions. "As soon as the number of unvaccinated people rises to a high enough level, it's like putting fuel on a fire," he said.
He also attributed the resurgence to a loss of collective memory. "We haven't had measles around for a long time... We're a victim of that success now," Ferrari said, urging renewed vigilance.
In response, the Pennsylvania Department of Health has updated its vaccination recommendations. Children as young as nine months are now advised to receive the MMR vaccine early, and adults unsure of their vaccination history — particularly those born before 1989, who may have received only one dose — are encouraged to seek a booster.
Globally, measles remains a devastating threat, killing an estimated 250 children under five every day. Ferrari stressed that the current US outbreak is a stark reminder of the disease's severity. "It's going to be palpable now how severe this thing is," he said.