Confirmed U.S. measles cases have passed 5,000 this year, according to the CDC’s Friday update, as outbreaks continue to expose gaps in community protection. The agency’s count reached 5,182 through November 5, more than twice the 2,289 cases reported in all of 2025.
The Nov. 6 CDC update includes confirmed cases reported to the CDC by noon Thursday.
Most cases are connected to outbreaks
The CDC counted 43 new outbreaks during 2026. Some 4,993 cases, or 96% of the national total, were associated with outbreaks, including outbreaks that began in 2025.
The total includes 5,164 cases reported by 47 jurisdictions, with New York City and New York State counted separately, and 18 cases among international visitors. An outbreak is defined as three or more related cases.
Federal death count remains subject to review
The CDC’s table lists four deaths for 2026 and says that number is subject to change as additional information becomes available and reviews are completed.
The agency is working with the Council of State and Territorial Epidemiologists on a standardized definition for measles deaths to support consistent classification across jurisdictions. Its national reports and state health department updates can follow different schedules.
Vaccination gaps leave room for spread
The CDC says MMR vaccination coverage among kindergartners fell from 95.2% in the 2019-20 school year to 92.4% in 2025-26, leaving approximately 280,000 kindergartners at risk. Local vaccination rates can vary widely even within a state.
Measles spreads through the air when an infected person coughs or sneezes. The CDC says two doses of the measles, mumps and rubella vaccine are 97% effective at preventing measles, compared with 93% for one dose.
The agency advises people to discuss vaccination with their health care provider, particularly before travel. State health departments have the most current information about outbreaks in their own communities.
JBizNews Desk | Health
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