The United States recorded 4,410 confirmed measles cases as of October 15, 2026, according to the CDC’s weekly update released October 16. That is an increase of 330 cases in one week — an 8.1% jump — and the highest annual total since 1991, with more than two months still left in the year.
Pennsylvania remains the epicenter. State data show roughly 1,260 cases and at least five (possibly six) measles-associated deaths. The CDC, by contrast, has confirmed only two measles-associated deaths nationwide for 2026 and has not named the states. The discrepancy stems from a change last month: CDC began using National Center for Health Statistics mortality data instead of relying primarily on state reports. Pennsylvania health officials and independent trackers continue to list the higher state death toll.
The CDC has agreed to send an Epidemic Intelligence Service “disease detective” to Pennsylvania after the state requested Epi-Aid support. As of mid-October the final agreement was still pending amid political friction — HHS Secretary Robert F. Kennedy Jr. had publicly criticized the state’s handling of death reporting. New York declared a statewide disaster emergency earlier in the month as cases rose near the Pennsylvania border.
Age breakdowns from the CDC show children and teens 5–19 years old account for about 42% of cases, adults 20+ for 41%, and children under 5 for 17%. Roughly 10% of cases have required hospitalization (451 nationally). About 95% of cases are in people who are unvaccinated or of unknown vaccination status.
What parents should watch
Sources: CDC measles weekly update (Oct 16), Pennsylvania Department of Health, Reuters, Contagion Live, CIDRAP, Al Jazeera. This is a parent briefing, not medical advice. Confirm numbers with official sources and speak with a clinician about vaccination.
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