State health agencies across the country have recorded eight measles-associated deaths in 2026, while federal disease surveillance tallies list four because federal officials do not automatically incorporate state figures into their national count. The split comes as confirmed infections nationwide reached 5,182 by November 5, 2026, according to the Centers for Disease Control and Prevention, rising 6.8 percent after 330 cases were added in a single week. The total is more than 2.3 times the 2,289 infections recorded in all of 2025 and marks the highest annual level observed in the United States since 1991.
Three measles-linked fatalities occurred within a single week in early November across New York, Pennsylvania, and Wisconsin, ending multi-decade spans without any measles deaths in all three states. New York officials confirmed the death of a child on November 2 in a northern rural cluster, following Governor Kathy Hochul's declaration of a state disaster emergency in October. Pennsylvania reported its sixth measles fatality of the year on November 4, involving an unvaccinated 21-year-old woman in Jefferson County with postpartum complications. In Wisconsin, health officials confirmed that an infant died from measles on November 5 as that state's caseload climbed to 431 infections across 13 counties.
Outbreaks Concentrate in Coverage Gaps
Forty-three newly recorded outbreaks or clusters continuing from 2025 account for 96 percent of confirmed infections this year, totaling 4,993 cases across 47 American jurisdictions. The country's largest outbreak remains centered in Pennsylvania, where cases climbed to 1,317 across 43 counties by late October, resulting in 251 hospitalizations. The Pennsylvania Department of Health reported that less than 1 percent of those infected had received an immunization, with infections heavily clustered in Lancaster County communities with depressed coverage. State health nurses administered more than 10,000 vaccine doses through community clinics to curb local spread.
National surveillance figures show 96 percent of all infected individuals in 2026 were unvaccinated or had an unknown vaccination history, while recipients of one or two doses made up two percent each. CDC data show kindergarten MMR immunization coverage slipped to 92.4 percent during the 2025-2026 school year, dropping below the 95 percent threshold needed for community herd protection while exemptions reached 4.2 percent. In response to rising transmission hazards, Wisconsin health authorities recommend that infants aged 6 to 11 months receive an early MMR dose if they face elevated exposure risks. A specialist panel at the Pan American Health Organization is scheduled to assess whether the United States will retain the measles elimination status it has held since 2000.
