Measles resurges in the U.S., reaching a 35-year high in 2026

U.S. measles cases in 2026 have reached a 35-year high, surpassing 1991 levels with more than 2,300 cases reported so far as outbreaks flare across multiple states. Most infections are among unvaccinated children, and public health teams are conducting intensive contact tracing and vaccination efforts to contain spread, highlighting ongoing challenges and funding pressures even as some communities maintain high overall vaccination rates.