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Measles is one of the most contagious human diseases known.
Because measles is so contagious, it can easily cross borders. In 2023, an estimated 10.3 million people were infected with measles. Right now, measles outbreaks are happening in every region of the world. Anyone who is not protected against measles can get measles while abroad and easily spread it to others when they return home.
Although measles was declared eliminated in the United States in 2000, measles cases and outbreaks continue to occur in the United States due to unvaccinated international travelers. Large measles outbreaks are possible when travel-related measles cases reach at-risk U.S. populations with low immunization against measles. In 2019, the U.S. nearly lost its elimination status with almost 1,300 measles cases from a large outbreak in New York and cases in 30 additional states. After a decrease in global measles incidence during the COVID-19 pandemic, measles activity globally and in the United States continues to rise.
This table is based on provisional monthly surveillance data reported to the World Health Organization (Geneva) as of May 2026. The data reflected covers October 2025 – March 2026.
WHO updates data on measles outbreaks each month.
Measles outbreaks worldwide, data and statistics, plus the work we do on these vaccine-preventable diseases to help global health security.
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