As of October 15, 2026, the Centers for Disease Control and Prevention reported 4,410 confirmed measles cases in the United States for the year — an 8% increase of 330 cases in a single week. This is the highest annual total since 1991, nearly double the 2,289 cases recorded for all of 2025, and continues a surge that has persisted across 47 jurisdictions.
Pennsylvania remains the epicenter, with the state Department of Health confirming 1,260 cases across 43 counties as of October 16, including 238 hospitalizations and five confirmed measles-associated deaths. A sixth death, reported by the Franklin County coroner in a 39-year-old unvaccinated woman with underlying conditions, is under state review. Fewer than 1% of Pennsylvania cases have occurred in fully vaccinated individuals. Lancaster County has reported the highest concentration (around 452 cases).
The CDC has confirmed only two national measles-associated deaths for 2026 while noting the figure is subject to change, and has deployed additional support to Pennsylvania. About 96% of US cases are outbreak-associated, and roughly 95% involve people who are unvaccinated or of unknown vaccination status. Children and teens aged 5–19 make up the largest share (about 42%), followed by adults 20+ (about 41%). Hospitalization rates remain near 10% nationally.
Background
Measles was declared eliminated in the United States in 2000. The current resurgence began with an outbreak in Texas in early 2025 and has accelerated amid declining MMR vaccination coverage in some communities. Two doses of the MMR vaccine are approximately 97% effective at preventing measles. Complications can include pneumonia, encephalitis, and, rarely, death; infants too young to be vaccinated and immunocompromised people are at highest risk.
What changed this week
The latest CDC update (through October 15) showed the largest weekly jump of the recent period. Pennsylvania’s official tally crossed 1,260 with new cases reported in multiple counties, and the Franklin County coroner’s report added another potential fatality to the state total under review. New York has declared a statewide disaster emergency related to measles, and Kentucky and Ohio have also seen notable increases.
Competing viewpoints
Public health agencies emphasize that the vast majority of cases are in unvaccinated people and that vaccination remains the most effective prevention. Some community and political voices have raised concerns about vaccine mandates, trust in institutions, and the accuracy of death counts when state and federal definitions or reporting lag. Infectious-disease specialists note that the number of deaths in Pennsylvania is higher than expected from historic case-fatality rates, suggesting under-counting of milder cases or other factors still under investigation.
What parents should watch next
This is an educational summary based on publicly available CDC, Pennsylvania Department of Health, and news reports as of October 18, 2026. It is not medical advice. Consult your pediatrician or public health authorities for guidance specific to your family.
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