Pennsylvania is now at the center of one of the most acute measles concerns in the United States, and the timing could not be more challenging.
As of June 26, 2026, the Pennsylvania Department of Health has confirmed 84 measles cases across eight counties. Of those cases, 72 are linked to a single ongoing outbreak that originated in Lebanon and Lancaster Counties in late April and has since expanded to six counties. Lancaster County alone has reported 38 cases, with a kindergarten vaccination rate of approximately 88.5 percent, well below the 95 percent threshold scientists say is necessary to prevent community spread.
