Pennsylvania Measles Deaths Raise Alarm as Outbreak Spreads
Two unvaccinated Lancaster County residents have died as Pennsylvania confronts its largest measles crisis in decades.
Pennsylvania has confirmed two measles-related deaths in Lancaster County, the state’s first such fatalities in 35 years. The deaths come as the Pennsylvania measles outbreak has grown to 393 confirmed cases across 28 counties in 2026, raising new concerns about falling vaccination rates and the return of a disease once rarely seen in the United States.
The Pennsylvania Department of Health announced the deaths Tuesday, August 25. Both people were unvaccinated residents of Lancaster County. State officials have not released their ages, names or other identifying information, citing the families’ privacy.
The deaths are also believed to be the first measles-associated deaths reported in the United States in 2026.
Pennsylvania Measles Outbreak Reaches 393 Cases
Pennsylvania health officials have confirmed 393 measles cases in 28 counties so far this year. Lancaster County remains at the center of the outbreak, with 185 cases reported there, according to the University of Minnesota’s Center for Infectious Disease Research and Policy.
Pennsylvania currently has the third-highest number of measles cases in the nation, behind Utah and South Carolina, according to the latest federal data cited by The Philadelphia Inquirer.
The situation has changed dramatically from just one year ago. Pennsylvania reported only 16 measles cases during all of 2025.
Children account for roughly one-third of Pennsylvania’s cases this year, according to state data reported by The Philadelphia Inquirer. None of the people diagnosed in Pennsylvania this year had been fully vaccinated against measles.
That does not mean vaccination makes infection completely impossible. No vaccine provides perfect protection. But the numbers reinforce what public health experts have said for decades: vaccination dramatically reduces the risk of catching measles and suffering severe complications.
Why Measles Is More Dangerous Than Many People Realize
Measles is sometimes remembered as a routine childhood illness from generations past. Medical experts say that description understates the danger.
The virus is extremely contagious. It spreads through the air when an infected person coughs, sneezes or even breathes. The Pennsylvania Department of Health says the virus can remain infectious in the air and on surfaces for up to two hours after an infected person leaves an area.
Early symptoms can include:
- High fever
- Cough
- Runny nose
- Red or watery eyes
- A rash that usually begins on the head and moves downward
Symptoms may appear seven to 21 days after exposure.
The greatest concern is what can happen after infection.
Pennsylvania health officials say measles can cause serious complications, including pneumonia and swelling of the brain. Nearly 20 percent of people who contract the disease may require hospitalization, according to the state. Death occurs in roughly one to three of every 1,000 measles cases.
Pennsylvania Health Secretary Dr. Debra Bogen said many people no longer recognize how serious measles can become because widespread vaccination kept it largely out of Pennsylvania for more than three decades.
“People are not familiar with this disease and don’t fully understand the potential severity of the illness,” Bogen said.
MMR Vaccine Provides Strong Protection
The measles, mumps and rubella vaccine, commonly called the MMR vaccine, remains the primary tool used to prevent measles.
Pennsylvania health officials say two doses provide about 97 percent protection against measles, with protection generally considered long-lasting.
The World Health Organization has also emphasized the importance of high vaccination coverage. Because measles spreads so easily, WHO estimates that about 95 percent of a population must be vaccinated to prevent sustained transmission and provide community protection.
That community protection is especially important for people who cannot receive certain vaccines because of age or medical conditions.
What Does Herd Immunity Mean for Measles?
Herd immunity occurs when enough people in a community are immune that a virus has difficulty finding new people to infect.
For measles, the threshold is unusually high because the disease is so contagious. WHO says approximately 95 percent vaccination coverage is needed to provide that level of population protection.
When vaccination rates fall below that threshold in a community, outbreaks become easier to sustain.
Lancaster County at the Center of the Crisis
Lancaster County has faced repeated measles exposures throughout the spring and summer.
On August 19, the Pennsylvania Department of Health warned that people may have been exposed during a soccer camp at Millersville University on August 4 and 5 and at a Whole Foods Market in Lancaster on August 12.
Earlier exposure warnings involved other public locations, including the Lancaster County Courthouse and retail stores.
Vaccination coverage in the county is also below the level public health experts consider necessary to prevent sustained measles transmission.
According to reporting based on state vaccination data, approximately 87.6 percent of Lancaster County kindergartners were vaccinated against measles, compared with about 93.2 percent statewide. Both figures are below the approximately 95 percent community protection level recommended for measles.
It is important, however, not to reduce the outbreak to a judgment about any single community.
Vaccination decisions can be affected by religious beliefs, access to health care, misinformation, distrust of institutions and personal concerns about vaccine safety. Effective public health outreach depends on addressing those concerns respectfully while providing reliable medical information.
Pennsylvania Expands Its Response
The Shapiro administration says it has significantly expanded vaccination and public education efforts since the outbreak began in April.
The Department of Health has operated 91 measles vaccine pop-up clinics and administered more than 4,100 MMR vaccinations at those sites. Another 40 clinics are planned in the coming weeks.
Vaccination demand also appears to be increasing.
More than 35,000 Pennsylvanians received an MMR vaccine in July, about 10,000 more doses than during a typical month, according to the governor’s office.
Governor Josh Shapiro urged families to seek information from trusted medical professionals.
“Measles does not care about your county, your faith, or your social circle,” Shapiro said, warning that people who remain unvaccinated face greater risk of infection.
The state is also working with schools and health care providers to distribute guidance as students return to classrooms.
That timing matters. Schools bring large numbers of children into close contact, creating opportunities for a highly contagious virus to spread rapidly when vaccination levels are low.
What Families Should Do Now
Health officials are urging Pennsylvanians to check their vaccination records rather than assume they are protected.
People who are uncertain about their vaccination history should speak with a physician, pediatrician or other health care provider.
Pennsylvania recommends that anyone who believes they has been exposed to measles and develops symptoms contact a medical provider before simply walking into a clinic or waiting room. That allows health care workers to take precautions that can reduce exposure to others.
Residents can also contact the Pennsylvania Department of Health at 877-PA-HEALTH, or 877-724-3258.
Families should consider three basic steps:
- Check vaccination records. Confirm whether children and adults have received the recommended MMR doses.
- Watch for symptoms after possible exposure. Fever, cough, runny nose, red eyes and a spreading rash may require medical evaluation.
- Call before arriving for treatment. If measles is suspected, alert the medical facility so staff can reduce exposure to other patients.
A Disease Once Pushed Back Is Returning
The tragedy in Lancaster County is a reminder that success against infectious disease can be fragile.
For decades, measles became uncommon enough that many younger physicians had never treated a case and many parents had never seen one.
That was not because the virus became harmless.
It was because vaccination stopped it from spreading widely.
Pennsylvania now faces the consequences of gaps in that protection. Two families are grieving. Hundreds of residents have been infected. Public health agencies are again organizing vaccination clinics, tracing exposures and warning communities about a disease that had nearly disappeared from everyday American life.
The debate surrounding vaccination can be politically and emotionally charged. Families have legitimate questions and deserve clear answers rather than ridicule or fear.
But the evidence should remain at the center of that conversation.
Two doses of the MMR vaccine provide strong protection. Nearly all of Pennsylvania’s 393 cases this year have occurred among people without full vaccination protection, and both people who died were unvaccinated.
The deaths in Lancaster County offer a painful warning.
Measles prevention does not depend only on what government agencies do after an outbreak begins. It also depends on thousands of families checking records, talking with trusted health professionals and making informed decisions before another exposure occurs.
For Pennsylvania residents, particularly families preparing for the school year, now is a good time to check vaccination status and ask questions.
Public health works best before the emergency reaches the hospital.
