Measles Outbreak in the US: Key Facts You Should Know

Speedy Summary

• Outbreak Details: The U.S. is experiencing it’s most severe measles resurgence as 2019,with Ohio becoming the fifth state to declare an outbreak in 2025. Texas, Oklahoma, New Mexico, and Kansas are among others affected.
• Case Numbers: As of 27 March, the CDC has confirmed 483 cases across 19 states. Texas leads with 400 cases; other outbreaks include New Mexico (44 cases), Kansas (23), Ohio (10), and Oklahoma (7).
• Mortality & Hospitalizations: One child in Texas has died from measles-the first recorded measles death in a decade-and another potential measles-related fatality is being investigated. There have also been 70 hospitalizations this year.
• Vaccination Insights: Nearly all affected individuals-97%-are either unvaccinated or have unknown vaccination status. The majority of cases involve young people under the age of 19.
• Origins & Spread: Initial outbreaks began in January due to travel-associated transmissions from unvaccinated individuals; rural communities with low vaccination rates played a key role in spreading the disease regionally and across borders.
• Vaccination Rates Decline: National vaccination rates for kindergarteners dropped below 93%, substantially reducing herd immunity thresholds needed to prevent contagion.

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