Pennsylvania measles update as of September 18

The Pennsylvania Department of Health (DOH) today announced that 767 measles cases have been confirmed across 38 counties in Pennsylvania so far in 2026 as of September 18.

Key updates include:

-New Positive Cases (since September 16, 2026): 36

-Total Counties: 38

-Total Cumulative Cases: 767

-Total Hospitalizations: 150

-Total Confirmed Measles-Associated Deaths: 4

-Measles cases among vaccinated individuals: 4 (less than 1% of cases)

Lancaster County reports the most with 324, followed by Mifflin County with 93 and Chester County with 72.

Pennsylvania leads the nation in measles this year, followed by South Carolina (671), Utah (519), Texas (192), Virginia (179) and Ohio (178).