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.
More Southwest Border news
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The San Luis port of entry from Sonora, Mexico, is Arizona’s westernmost border crossing, and could see delays for four to five months starting later this month. -
Every year, Arizona State University Barrett Honors College professor Abby Wheatley brings her class on transnational migration to the Arizona borderlands. -
The U.S. Border Patrol has a new leader: Rosario Vasquez has been named chief of the agency. -
The Quitobaquito tryonia is a tiny freshwater springsnail — no bigger than the size of a poppy seed — that can only be found inside Organ Pipe Cactus National Monument in southern Arizona. -
U.S. officials say the practice of stealing crude oil has become the most important non-drug revenue stream for Mexico-based cartels.
