Measles Update — United States, January 1–April 17, 2025
This report describes measles cases reported to CDC by 25 U.S. jurisdictions as of April 17, 2025.
www.cdc.govHere are the latest developments on measles.
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United States: The CDC reported a sharp rise in measles activity in 2025, with the year approaching the highest case counts in over two decades. By late 2025, the national total had surpassed 1,500 cases, driven by multiple outbreaks across several states and a large share of cases in unvaccinated individuals. These trends continued into early 2026 with ongoing outbreaks and renewed public health messaging to vaccinate children and eligible adults.
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Global context: WHO and PAHO highlighted sustained measles activity in the Americas during 2025, with thousands of confirmed cases and multiple deaths, underscoring gaps in immunization coverage in parts of the region. The global picture in 2023–2024 showed continued transmission in many areas, even where measles had previously been controlled.
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Notable outbreak patterns: Several large outbreaks in 2025 were linked to unvaccinated populations and faced cross-border transmission, including cases moving from the U.S. to neighboring countries. Public health agencies emphasized vaccination, outbreak response, and post-exposure prophylaxis where appropriate.
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Regional highlights (Americas): PAHO reported that as of mid-2025, the Americas counted thousands of measles cases with a notable rise compared with 2024, indicating renewed transmission despite long-standing elimination status in some countries.
If you’d like, I can pull the most recent country-by-country numbers for your region (Czech Republic/Europe) or provide a short briefing tailored to Prague, including vaccine guidance and local public health contacts.