Lancaster County, Pa. — Pennsylvania is experiencing its largest measles outbreak in decades, with 767 reported cases and four deaths since the surge began in April. The outbreak, concentrated mainly in Lancaster County and affecting 38 of the state's 67 counties, has led to increased vaccination efforts, but also sparked political and cultural tensions across the region.

The highly contagious disease has hospitalized 150 people in Pennsylvania this year. State health officials report an 84 percent increase in measles vaccinations in August compared to previous months, signaling a growing public response amid the crisis. Despite this, resistance to vaccinations persists, particularly within Amish and Mennonite communities, where vaccine uptake remains low.

The outbreak’s epicenter, Lancaster County, home to the nation’s largest Amish population, has seen widespread transmission. While vaccination is not prohibited within Amish or Mennonite groups, it has not been commonly embraced. According to a 2022 survey, only about 30 percent of Amish families in the area have vaccinated their children. Some community members express skepticism toward medical interventions, citing distrust fueled by misinformation and concerns over vaccine safety.

“I’m not scared of measles,” said Mervin Zook, an Amish dairy farmer in Gordonville who sells at local markets. He noted that his unvaccinated family members who contracted measles recovered without complications. Others voiced similar views, emphasizing natural recovery and alternative health perspectives.

Health experts, however, warn of the serious risks associated with measles, including pneumonia and brain swelling, especially for young children and infants who are unvaccinated or too young to receive the standard MMR vaccine. Pennsylvania health officials have urged vaccinations for children as young as six months in affected areas to curb transmission. Vaccination coverage among U.S. kindergartners declined to about 92.4 percent in the 2025-2026 school year, below the 95 percent threshold needed for herd immunity, contributing to the resurgence.

The outbreak in Pennsylvania is part of a broader national trend, with more than 3,400 measles cases across 45 states reported this year—the highest annual total since measles was declared eliminated in 2000. Other significant outbreaks have occurred in South Carolina and Indiana, often linked to close-knit, vaccine-hesitant communities.

The crisis has also highlighted friction between state and federal health agencies. Pennsylvania’s Health Secretary, Dr. Debra Bogen, challenged the Centers for Disease Control and Prevention’s decision not to include the state’s four reported measles-related deaths in the national tally, asserting that this omission undermines outbreak response efforts. The CDC responded that it is working to standardize definitions of measles deaths to ensure consistent reporting and emphasized ongoing support for Pennsylvania’s public health response.

Meanwhile, Robert F. Kennedy Jr., Pennsylvania’s health secretary until recently, has publicly questioned whether measles directly caused the reported deaths, a stance that health officials say has fueled vaccine misinformation and mistrust.

The outbreak has prompted public health alerts beyond Pennsylvania. California and Colorado have reported potential exposure incidents involving unvaccinated individuals traveling through multiple counties. Philadelphia health officials also warned of possible measles exposure at a children’s hospital.

Amid the public health efforts, vaccine hesitancy remains entrenched for some. Several individuals cited concerns about vaccine safety, influenced in part by negative experiences with COVID-19 vaccines, which has complicated outreach efforts. Others expressed a preference for natural immunity or alternative health approaches.

Despite the challenges, state officials continue to encourage vaccination as the most effective tool to combat the outbreak and prevent further illness and deaths. As the measles virus continues to spread, the response in Pennsylvania highlights the complexities of managing infectious disease outbreaks in diverse communities amid a polarized public health environment.