Overview
- Pan American Health Organization experts met in Washington this week to review 35 member‑state reports and to decide if U.S. measles spread has continued without interruption for 12 months.
- The Centers for Disease Control and Prevention reports more than 5,000 confirmed U.S. cases in 2026, with roughly 96 percent in people who were unvaccinated or had unknown vaccination status.
- Genomic analyses and epidemiological reviews cited by investigators indicate some transmission chains may have persisted for more than a year, a key criterion for losing elimination status.
- The outbreak has produced hundreds of hospitalizations and confirmed deaths, and a Johns Hopkins tool estimates total response and economic costs near $83 million.
- Public‑health experts point to falling MMR coverage, rising nonmedical exemptions and growing vaccine hesitancy—including influence from high‑profile critics of vaccination—as the main drivers of the resurgence and its spread in undervaccinated communities.