Pennsylvania has confirmed four measles-associated deaths in 2026 — the most in the US in decades — as the state battles nearly 700 cases across 38 counties, reigniting debate over vaccination rates and how deaths are counted.

Pennsylvania has confirmed four measles-associated deaths in 2026, marking the deadliest outbreak in the United States in decades. The Pennsylvania Department of Health (DOH) reports that all four individuals were unvaccinated, reigniting national concern over declining childhood immunization rates.
| Metric / Indicator | Value / Context |
|---|---|
| Total PA Cases (2026) | 693 confirmed cases (38 counties) |
| Hospitalization Rate | ~20% of identified cases |
| National MMR Coverage (2019–20) | 95.2% |
| National MMR Coverage (2025–26) | 92.4% (~280,000 kindergartners unprotected) |
| Vaccine Efficacy | Two doses of MMR provide ~97% lifetime protection |
| Historical Fatality Rate | 1 to 3 deaths per 1,000 cases |
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