Measles Resurgence in the U.S.: Pennsylvania at the Epicenter
The United States is facing a significant resurgence of measles, marking the worst outbreak in decades, particularly in Pennsylvania.
Recent data from the U.S. Centers for Disease Control and Prevention indicates that over 4,580 measles cases have been reported since October 22, a figure that doubles the total reported for all of 2025. That’s quite alarming.
According to the CDC, an overwhelming 96% of the individuals who contracted measles this year were either unvaccinated or had unknown vaccination status.
This outbreak has been especially pronounced in Pennsylvania, where the local Department of Health has confirmed at least 1,338 cases across 44 counties so far this year. As of October 21, there were 21 new cases reported. Tragically, more than 250 individuals have been hospitalized, and five fatalities have occurred.
Counties like Lancaster and Mifflin, notable for their high case numbers, have seen a major impact on local Amish communities, who typically have lower vaccination rates. Of the five fatalities, three were residents of Lancaster County.
This past Thursday, Pennsylvania’s Secretary of Health, Dr. Debra Bogen, convened a meeting with healthcare providers in Mifflin County to assess how best to address the outbreak. She mentioned, “Our state metrics and data tell part of the story of the measles outbreak in Pennsylvania, but listening to the people on the ground caring for those in affected communities like Mifflin County is essential to refining our public health response.” It’s about really understanding the on-the-ground situation, I suppose.
Health officials are emphasizing vaccination as a crucial line of defense against the disease. The measles, mumps, and rubella (MMR) vaccine is nearly 97% effective after two doses, according to the CDC, while one dose provides about 93% effectiveness.
Interestingly, healthcare providers in Pennsylvania are reporting a rise in public interest in measles vaccinations. Throughout the first three weeks of October, over 39,000 measles vaccines were administered—a significant increase compared to the typical monthly average of around 25,000.
In a related note, earlier this month, New York Governor Kathy Hochul declared a disaster emergency amid rising measles cases. The state has seen over 160 confirmed cases, according to data from the New York State Department of Health.
Utah, too, has reported a high incidence of measles, with more than 700 cases this year—though notably, there haven’t been any new diagnoses in the past three weeks. And South Carolina, which dealt with its own outbreak, recorded at least 997 measles cases in 2026, although that outbreak ended in April.
As this situation evolves, it’s clear that vaccination remains a vital strategy for controlling these outbreaks and protecting communities.
