US Measles Cases Hit 35-Year High as Delaware Battles Local Cluster The United States has recorded more than 2,300 confirmed measles cases in 2026 so far, surpassing the full-year total from 2025 and marking the highest annual number since 1991. Cases have been reported in more than 40 jurisdictions, with about 93 percent occurring in people who were unvaccinated or whose status was unknown. Officials note that public health capacity has been strained by recent cuts, making rapid response more