CDC Updates on Measles Outbreak in the United States

As of April 17, 2025, the United States has reported approximately 800 cases of measles, marking the second highest annual case count in the past 25 years. This significant increase was detailed in an April 24 update published in the Morbidity and Mortality Weekly Report by the CDC. The ongoing multistate outbreak predominantly affects tightly-knit communities with low vaccination coverage, especially in New Mexico, Oklahoma, and Texas, where the outbreak started in January 2025.

The report highlights that about 82% of the cases in these states are linked to the current outbreak. Overall, 96% of those infected were either unvaccinated or had unknown vaccination status. Hospitalizations have occurred in 85 patients, and unfortunately, three deaths have been reported. Notably, 44 out of 48 imported cases involved U.S. residents.

Experts from the CDC indicate that the rise in measles cases is compounded by a concerning decline in vaccination rates across many U.S. regions, with coverage falling below the estimated 95% needed to prevent outbreaks. Additionally, increased global measles transmission, especially in areas frequently visited by U.S. travelers, further elevates the risk of ongoing domestic spread.

This update emphasizes the importance of maintaining high vaccination coverage to control and prevent future outbreaks, especially considering the persistent global and domestic transmission risks. For more detailed information, refer to the full report: source.