US records 4,410 measles cases as outbreak grows
Summary
The United States has reported 4,410 measles cases in 2026, with the largest outbreak occurring in Pennsylvania. The CDC is assisting state health officials to control the spread, and Pennsylvania has vaccinated thousands of people to fight the outbreak.Key Facts
- There have been 4,410 measles cases in the U.S. in 2026 so far.
- Pennsylvania has the largest outbreak, with 1,222 cases across 42 counties.
- The outbreak in Pennsylvania caused 225 hospitalizations and five confirmed deaths.
- The CDC sent an investigator to Pennsylvania to help control the outbreak.
- Vaccination efforts in Pennsylvania include more than 5,900 MMR vaccines given at 202 pop-up clinics.
- Measles vaccination rates among U.S. kindergarteners dropped from 95.2% in 2019–2020 to 92.4% in 2025–2026.
- New York declared a measles disaster emergency to allow faster vaccine delivery and testing.
- About 280,000 U.S. kindergarteners are at risk for measles due to lower vaccination coverage.
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