The United States has been experiencing its largest measles outbreak since 2019, and the World Health Organization (WHO) has recently stated that the outbreak's source is "unknown."
On March 27, 2025, the WHO published Disease Outbreak News (561), confirming that measles was declared eliminated in the United States in 2000. Since then, imported measles cases have been reported, as this highly contagious disease remains endemic in many parts of the world.
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