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● LIVE Updated 1d ago · 21 sources tracked

Doctors warn of severe adult measles cases as Lancaster County outbreak grows

A measles outbreak that began in April has resulted in 84 cases across Pennsylvania in 2026. The center of the outbreak is in the Lancaster-Lebanon region, where 72 cases have been identified. State health officials are partnering with local communities to increase vaccination rates and combat the spread.

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What changed

The outbreak has expanded to seven counties, with new cases reported in York and Chester counties.

Live updates

  1. Pennsylvania Measles Outbreak Spreads to Seven Counties

    A measles outbreak that began in April has resulted in 84 cases across Pennsylvania in 2026. The center of the outbreak is in the Lancaster-Lebanon region, where 72 cases have been identified. State health officials are partnering with local communities to increase vaccination rates and combat the spread.

    What's confirmed:

    • Pennsylvania has identified 84 measles cases in 2026.
    • The Lancaster-Lebanon region has 72 cases.
    • The outbreak began in late April.
    • The Pennsylvania Department of Health is working with local health care and community partners to address the increase in cases.
    • Vaccination is the best protection against measles.

    Still unconfirmed:

    • Wastewater shows a measles signal near Philadelphia.
    • Low vaccine rates and lingering distrust threaten containment in Lancaster.
    • Doctors are warning of severe measles cases in adults.
    confidence 90%