Confirmed measles cases in the United States have reached 4,588, more than doubling last year's total, CIDRAP, Contagion Live and a Reuters dispatch carried by KSL reported. The Centers for Disease Control and Prevention added 178 cases in the latest weekly update, a 4.0% rise from 4,410, Contagion Live said. Over the past two weeks 508 new infections were confirmed, more than the nation reported from 2022 through 2024 combined, CIDRAP reported.

There have been 43 measles outbreaks this year, with one new outbreak since last week, CIDRAP said. Contagion Live said 96% of confirmed cases are outbreak-associated. Only 18 cases have been reported among international visitors, CIDRAP and Contagion Live reported. Children under 5 account for 17% of cases and ages 5 to 19 for 42%, CIDRAP said. About 10% of cases overall have required hospitalization, including 16% of cases in children under 5, CIDRAP reported. Reuters via KSL put measles-related hospitalizations this year at 479.

Pennsylvania's state health department has reported five measles-related deaths so far in 2026, but the CDC has confirmed only three measles-associated deaths, Reuters via KSL reported. Pennsylvania alone had 1,338 cases and 255 hospitalizations as of October 23, the Reuters report said. Contagion Live said the 2026 total is roughly double the 2,289 cases reported for all of 2025. CIDRAP said the CDC has acknowledged the scale of the outbreak while states continue to report new clusters. Adults 20 and older account for about 41% of cases, the Reuters report via KSL said, just behind the 5-to-19 age group.

What we know: CDC-confirmed US measles cases stand at 4,588 with 43 outbreaks and three CDC-confirmed deaths.
What we don't: Whether state-reported death counts will rise further ahead of CDC confirmation.