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A measles outbreak that began in south-central Pennsylvania in late April has grown to more than 70 confirmed cases, with state health officials urging unvaccinated residents to get immunized and pledging an aggressive response to contain the disease's spread.
Of the 84 total measles cases Pennsylvania has confirmed so far this year, 72 are linked to the current outbreak, which originated in the Lebanon and Lancaster county area and has since expanded to six counties. State Secretary of Health Dr. Debra Bogen traveled to Lancaster on Friday to address the situation, telling reporters that epidemiologists, community health nurses, and local partners are working urgently to bring measles under control, and that the state's contact tracing system remains fully operational.
More than 60 of those cases are concentrated in Lancaster and Lebanon counties alone, making those two counties the focal point of state response efforts.
Who Is Getting Sick
Every case the Pennsylvania Department of Health has documented involves a person who was either unvaccinated or could not confirm their vaccination status. Health officials have been clear: this is not a disease affecting any particular community or demographic group. The only consistent factor across all patients is a lack of vaccination.
Pennsylvania's kindergarten vaccination rate currently stands at 94%. That figure has not been enough to prevent the outbreak's spread.
What Measles Does to the Body
Measles is a highly contagious viral illness. Symptoms typically emerge seven to 14 days after exposure and begin with cough, runny nose, fever, and red, watery eyes. Small white spots can appear inside the mouth within a few days, followed by the disease's signature skin rash — usually flat, sometimes raised, and not itchy — that spreads across the head and body roughly three to five days after initial symptoms appear.
Complications can be severe. Penn State infectious disease specialist Dr. Fahmida McGann, who works at Penn State Health Lancaster Medical Center, described patients hospitalized with electrolyte abnormalities alongside kidney, liver, and blood count problems — conditions that left them vulnerable to organ failure, secondary infections, and bleeding. There is no fast cure for measles. Treatment is supportive only.
The disease can also lead to pneumonia, encephalitis, deafness, or intellectual disability. Deaths, while rare, do occur.
Vaccination Clinics Showing Early Results
State health officials and community partners have vaccinated more than 430 residents in the Lancaster and Lebanon region over the past two months through a combination of pop-up clinics and appointments with local providers. Health officials say that targeted effort is already producing results in the affected region.
Two doses of the MMR vaccine provide roughly 97% lifelong protection against measles, according to state health officials. Bogen, who noted her three decades as a pediatrician before her current role, said she encountered only a single measles patient throughout that career — underscoring how unusual this outbreak is by recent historical standards.
Vaccination clinic attendance has picked up. Jeffrey Martin of Lancaster General Health noted that people have been coming in not just for routine immunizations but out of specific concern about the outbreak.
State Response and Open Questions
Bogen's visit to Lancaster on Friday included a press conference alongside local medical leaders. She confirmed that the state's contact tracing infrastructure is fully engaged and that work will not stop until the outbreak is resolved.
She did not, however, fully answer questions about the precise origin of the outbreak or explain why this particular region of Pennsylvania has been disproportionately affected.
State officials described the outbreak as widespread rather than confined to any single setting or group. Anyone who is unvaccinated — child or adult — remains at risk.
Residents seeking a vaccination clinic can contact local health providers in the Lancaster and Lebanon area to find available appointments.
