Full Breakdown
Pennsylvania Measles Outbreak Surpasses 900 Cases
By Drooid · · How we work
Core Event
In late September 2026 the Pennsylvania Department of Health announced 55 additional measles infections, bringing the state total to more than 900 confirmed cases across 39 counties. Hospitalizations have risen to roughly 175, and four measles-associated deaths have been recorded, all among unvaccinated individuals. Fewer than 1 % of the cases involve people who have received the full two-dose MMR series.
Background & Context
Measles was declared eliminated in the United States in 2000, but the virus has re-emerged in under-vaccinated pockets. Pennsylvania’s outbreak began in late April 2026 and spread from rural Lancaster County into neighboring jurisdictions, including Chester County and the Philadelphia suburbs. Nationally, the disease has climbed to a three-decade high, with the CDC reporting 3,659 confirmed cases in the United States as of September 24 2026.
Data & Statistics
- Statewide cases: 890–903 (different agency reports)
- Hospitalizations: 173–176
- Deaths: four in Pennsylvania; CDC lists one national death
- Age distribution: majority 25-49, followed by 18-24; 31 % under 18
- Vaccination status: <1 % fully vaccinated; 97 % protection after two doses
- Kindergarten coverage: 92.4 % MMR in 2025-2026, down from 95.2 % in 2019-2020
- Vaccination effort: over 7,900 MMR doses administered statewide in 2026, with more than 5,300 given at 165 pop-up clinics
Official Statements & Responses
CDC guidance continues to recommend two MMR doses—first at 12-15 months and second at 4-6 years—citing 93 % effectiveness after one dose and 97 % after two. The agency initially excluded Pennsylvania’s four deaths from its national tally, later adding a single measles death to its website with a note that the figure “is subject to change.”
On-the-Ground Reports
Dr. Katherine Mascia, serving Amish families in Belleville, described a surge in severe cases requiring hospitalization or ICU care. County health director Jeanne Franklin highlighted collaboration with local organizations and businesses to raise awareness and increase vaccine uptake.
Conflicting Reports & Gaps
- Case counts: DOH cites 890 cases; the Inquirer and MyClallamCounty report 903; other outlets reference “over 900.” No single source provides a reconciled total.
- Death tallies: Pennsylvania officials list four deaths, while CDC’s national count shows only one death for the year, without specifying location.
- Elimination status: A PAHO review scheduled for November 2026 will assess whether continuous transmission exceeds the 12-month threshold that defines elimination.
Verbatim Quotes
- “I think it is concerning that there will be more outbreaks, some larger, some smaller, because it's clear from the national data that a proportion of parents are withholding their children from vaccination,” — Dr. William Schaffner, Vanderbilt University Medical Center
- “We are working all the time with organizations, businesses, community leaders — whoever we can get the attention of in the communities impacted,” — Jeanne Franklin, county health director
- “Dozens of additional vaccine clinics are scheduled for the upcoming weeks and months, based on community interest and need. Overall, state health center staff have administered more than 7,900 MMR vaccine doses to residents across the Commonwealth in 2026.” — DOH
Timeline
- Late April 2026: Outbreak first identified in Lancaster County.
- Late September 2026: CDC reports 3,659 U.S. cases; Pennsylvania adds 55 cases, pushing the state total above 900.
- Ongoing (September 2026 onward): DOH schedules additional pop-up vaccination clinics; CDC continues weekly national updates.