Pennsylvania has recorded more than 1,350 measles cases this year, making it the highest count of any U.S. state, according to state health figures.
More than a third of those infections have arisen in Lancaster County alone, which is home to the largest Amish population in the United States and now serves as the epicenter of the nation’s worst measles outbreak in 35 years. The contagious virus, officially considered eliminated from the U.S. since 2000, has spread as vaccination rates decline both within traditional communities and the general population.
Lancaster County Emerges as the Epicenter
State health figures show that three measles-associated deaths have occurred in Lancaster County, with two additional fatalities recorded in other parts of the state.
Governor Shapiro's unseemly rush to Lancaster County to convene a national press conference and his giddy delight in announcing two measles deaths was a morose commentary on the contemporary political dialogue. The performance was a replay of the Democrats' COVID playbook:… https://t.co/LvZf3br1dB
The surge has hit especially hard among the "Plain communities" of Amish and conservative Mennonites. Professor Mitchell noted that Amish families are highly social, with large households averaging seven or eight children, and regularly gather for church services held inside rotating family homes.
While the Plain communities avoid participating in many areas of modern society, they are not isolated. Residents interact with the general public at farmers’ markets, doctors’ offices, and local auction houses, creating multiple avenues for transmission.
Kindergarten immunization rates drop below preventive thresholds
National and state data point to a broader downward trend in immunization coverage. According to the Centers for Disease Control and Prevention, 92.4% of U.S. kindergarteners received the required MMR shots during the 2025–26 school year, down from 95.2% in 2019–20.
Pennsylvania’s overall kindergarten MMR vaccination rate fell to 93.2% by last year, sitting below the 95% threshold required to prevent community-wide outbreaks. Berwood Yost, director of the Center for Opinion Research at Franklin & Marshall College, wrote in a recent commentary that declining childhood vaccination rates are not limited to the Amish, noting that kindergarten coverage has dropped in every central Pennsylvania county since 2020. A 2022 survey by the center found that while the vast majority of Mennonite families reported having their children vaccinated, only about 3 in 10 Amish families did so.
Scholars emphasize that vaccine avoidance among the Amish is driven primarily by culture and tradition rather than strict theological doctrine. Steve Nolt, a professor at Elizabethtown College, stated that the Amish are sceptical of government intervention and do not see the need to engage with modern medicine.
However, attitudes began to cool further following the COVID-19 pandemic. Dr. Anne-Marie Derrico, chief medical officer at Union Community Care, noted that pandemic-era policies fostered distrust and conspiracy theories regarding modern medicine.
Shifts in Vaccine Acceptance Amid Ongoing Outbreaks
As the current outbreak intensifies, community responses are shifting. Public health officials are seeing renewed openness to inoculation among some Plain community residents.
Door-to-door and community outreach efforts are currently underway in Chester County and parts of neighboring Lancaster County to raise awareness and distribute vaccines. Experts emphasize that widespread immunization remains the primary defense against further transmission. Dr. Diego Hijano of St. Jude Children’s Research Hospital described receiving the shot as an act of community protection.
Measles cases surge nationwide amid state outbreaks
How many measles cases has the United States recorded overall this year?
The Centers for Disease Control and Prevention reports that the U.S. is enduring its worst year for measles since 1991, with more than 4,500 reported cases nationwide.
Which states besides Pennsylvania are experiencing large outbreaks?
Large outbreaks have also been reported in Texas, Utah, South Carolina, Wisconsin, and Florida, prompting New York Governor Kathy Hochul to declare a disaster emergency due to rising cases in neighboring states.
Let's set the record straight because @RobertKennedyJr’s post is inaccurate and misleading and he is making claims that have been debunked repeatedly by actual scientists and doctors.Secretary Kennedy called me yesterday morning to ask whether Pennsylvania needed any additional… https://t.co/Md2VLnEhOl
What sparked the political clash in Pennsylvania?
Following the state’s first two deaths, a political debate erupted between Pennsylvania’s Democratic Governor Josh Shapiro, who actively promotes vaccination efforts, and the Trump administration’s Health Secretary Robert F. Kennedy Jr., who has frequently raised alarms about vaccines.