The Pima County Health Department has confirmed a case of measles in an individual who recently traveled to the state from Mexico.
County health officials say the individual was quickly hospitalized after traveling across the border and isolated in a medical facility in Tucson.
Officials say there has been no known public exposure of the highly contagious illness in Pima County.
The case comes as a measles outbreak in Mohave County along the Utah border has reached 200 cases in recent months — the state’s largest outbreak in decades.
Sonora, the Mexican state that borders Arizona, confirmed 111 measles cases in 2025. The neighboring Mexican state of Chihuahua has had by far the largest outbreak in Mexico, with 4,481 confirmed cases last year.
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