The Pennsylvania Department of Health (PDH) is working directly with local health care and community partners to address the increasing number of measles cases statewide among people who are not fully vaccinated, particularly in the Lancaster-Lebanon region. n 2026 so far, 84 measles cases have been identified in Pennsylvania, with 72 cases in the Lancaster-Lebanon region alone, beginning in late-April, including: Berks (2), Dauphin (2), Lancaster (41), Lebanon (20), Northumberland (6), and York (1) counties. Earlier in the year, cases were identified in Lancaster (8), Montgomery (3), and Chester (1).

Because measles was essentially eradicated in the U.S. since 2000, the majority of health care providers have not treated a patient with the disease. To ensure Pennsylvania providers have the information they need, PDH issued multiple Health Alert Network messages outlining the signs and symptoms of measles and reminding clinicians to encourage patients to stay up to date on their vaccinations.

According to the Centers for Disease Control and Prevention (CDC), people most at-risk are: 

• Unvaccinated;
• Infants too young to have received the MMR vaccine; and 
• People from parts of the world where there is low vaccination coverage or where there is circulating measles. 

PDH currently provides school vaccination data at the county and state level. In the next couple of weeks, school-level vaccination information will be available online so families have additional information to make personal health and educational decisions. This is directly in line with the Shapiro Administration’s commitment to boosting public access to information and ensuring transparency in our work to protect public health.

People who believe they were exposed to measles and are experiencing symptoms should contact their health care provider or call the PDH’s toll-free hotline at 877-PA-HEALTH (877-724-3258).

More information on measles is available at www.pa.gov/measles.