One of the largest measles outbreaks in the U.S. is now centered in bordering areas of southwestern Utah and Arizona. In Southwest Utah, all but one of the 23 confirmed cases are among unvaccinated, school-age kids, the Southwest Utah Public Health Department reported. In Mohave County, Arizona, which health officials believe is connected to the Utah outbreak, there have been 42 confirmed cases of the highly contagious virus.

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