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US CDC works on standard definition for measles deaths as cases rise

By Thomson Reuters Sep 18, 2026 | 10:11 AM

Sept 18 (Reuters) – The US Centers for Disease Control and Prevention is working with the Council of State and Territorial Epidemiologists ​to develop a standardized case definition ‌for measles deaths, the agency said Friday, as the outbreak grows across the country.

Here are the details:

• The CDC reported 3,471 confirmed measles cases in the United ‌States ​as of September 17, up ⁠from 3,294 a week ⁠earlier, with no deaths recorded for 2026 in its national tally.

• The Pennsylvania Department of Health earlier this week reported two more ​measles-associated deaths, both in unvaccinated individuals, bringing the state’s total outbreak-linked fatalities to four.

• The ⁠CDC, however, has not ⁠included the deaths after the agency ​shifted to using mortality data from the National Center ​for Health Statistics for its national measles ‌death count, moving away from its previous reliance on state health departments — a change that has drawn scrutiny.

• The Pennsylvania health department on ⁠Thursday sought emergency support from the CDC to tackle its measles outbreak, on the condition that the agency ⁠recognize four ‌measles-associated deaths reported by the state.

• ⁠The CDC said it would update ​its ‌reporting as more information becomes available ​and relevant ⁠reviews are completed.

• On Wednesday, the US Senate health committee’s Republican chairman blamed the Trump administration’s approach to vaccines for recent measles deaths in Pennsylvania.

(Reporting by Siddhi Mahatole in Bengaluru; Editing by ​Vijay Kishore)