Pennsylvania Grapples With Significant Measles Outbreak, Cases Surge
Pennsylvania is experiencing the nation's third-largest measles outbreak, with 89 new cases reported in the last week, bringing the total to hundreds across more than two dozen counties. Lancaster County is a central hub with 181 cases, while Chester County,…
Philadelphia, PA, August 21, 2026 —
Pennsylvania is currently facing the nation’s third-largest measles outbreak, with a significant increase in cases reported over the past week. Health officials confirmed 89 new cases in the last seven days, pushing the statewide total into the hundreds. The outbreak has now spread across more than two dozen counties.
Lancaster County has emerged as a central hub for the outbreak, reporting a total of 181 cases. Chester County, the only county in the Philadelphia metropolitan area with reported cases, has documented 41 cases.
The current measles outbreak began in April. Analysis of the diagnosed patients this year reveals that children constitute approximately one-third of the 379 individuals affected. Notably, none of the diagnosed patients have been fully vaccinated.
As children return to school, health officials are expressing growing concern about the potential for further spread. This concern is particularly acute in areas where vaccination rates fall below the threshold required for herd immunity, a level of community immunity that helps protect vulnerable individuals.
Story summarized from the original created by Aubrey Whelan on www.inquirer.com, see more information here.
