Measles cases near 4,000 in U.S. as outbreaks continue
U.S. measles cases surpassed 3,800 in 2026 — the largest surge in decades — and 95% occurred in people who were unvaccinated or had unknown vaccination status.
The United States has now recorded more than 3,800 measles cases in 2026, extending the largest surge in decades and surpassing last year’s total by hundreds of infections with months still left in the year.