Pennsylvania measles outbreak tops 100 confirmed cases
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Pennsylvania health officials have confirmed 101 measles cases statewide in 2026, marking a sharp rise from 16 cases in 2025 and four in 2024. The outbreak, which began in late April 2026, now involves at least six counties, with the greatest concentration reported in Lancaster and Lebanon, and additional cases in Chester, Berks, Dauphin, Northumberland, and York. On Saturday, July 11, 2026, Philadelphia’s health department issued an urgent warning after learning an infected traveler passed through Philadelphia International Airport on July 4, between 7:30 a.m. and 11:15 a.m. in Terminals A, B, and C, prompting calls to verify measles vaccination status and watch for symptoms.
More context
Timeline
- 2024 Pennsylvania records four measles cases
- 2025 State health officials confirm sixteen cases
- Late April 2026 Measles outbreak first identified
- July 4 2026 Infected traveler passes through PHL
- July 4 2026 Exposure spans Terminals A through C
- July 11 2026 Philadelphia issues airport exposure advisory
- July 12 2026 State reports 101 confirmed measles cases
Why it matters
This measles outbreak could impact your health and safety. If you live in or visited Pennsylvania recently, especially the mentioned counties or Philadelphia airport, you might be at risk. Check your vaccination status and watch for symptoms like fever, cough, or a rash.
JQJO Editorial Desk · Human reviewed · AI assisted. Report a correction.
