Key facts
- People under 18 accounted for 33% of Pennsylvania's measles cases, per the state health department.
- Fewer than 1% of infected people in Pennsylvania were fully vaccinated, per the state health department.
- Unvaccinated people or those with unknown status accounted for 96% of US measles cases this year, per the CDC.
- Pennsylvania is the state hardest hit by the outbreak, followed by South Carolina and Utah, per CDC data.
- A Pan American Health Organization expert commission is due to review whether the US still meets measles elimination criteria at a meeting this week.
Pennsylvania's measles case count reached 1,505 as of November 9, 2026, up 18 from the previous update on Friday, according to the state health department's dashboard. The state reported 73 new cases over the past seven days as it battles its worst outbreak of the disease in years.
Measles-related hospitalizations rose to 290 from 287 in the previous update, and the state has reported six measles-associated deaths this year. People under 18 accounted for 33% of cases, and fewer than 1% of infected people in the state were fully vaccinated, per the dashboard.
The CDC reported 5,182 US measles cases as of November 5, the highest annual tally since 1991. People who were unvaccinated or whose vaccination status was unknown accounted for 96% of US cases this year. Pennsylvania remains the state hardest hit, followed by South Carolina and Utah, according to CDC data.
A Pan American Health Organization expert commission is due to review whether the US still meets the criteria for measles elimination at its meeting this week. The country has held that status since 2000.