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America’s Biggest Measles Outbreaks Have Very Different Death Tolls. Why?
State reports show six deaths in Pennsylvania, one in New York and one in Wisconsin, while the CDC lists four under a stricter verification rule.
State health departments reported eight measles deaths across three states in 2026, while the Centers for Disease Control and Prevention lists four as of Friday, Nov. 6.
The discrepancy arises from different counting methods; the CDC counts deaths only when the National Center for Health Statistics verifies measles as the underlying cause on death certificates.
Pennsylvania, which reports six deaths, counts fatalities within 30 days of symptom onset for lab-confirmed infections, excluding unrelated causes such as car crashes from its tally.
Wisconsin health officials announced an infant's death on Monday, Nov. 5, the state's first since 1990, while New York confirmed its first measles death in more than 30 years on Nov. 2.
The Council of State and Territorial Epidemiologists launched a working group to develop a standardized measles death definition, with work expected to be completed by year-end.