A growing measles outbreak along the Utah-Arizona border has spread to nearby communities, making it the nation's second-largest this year, health officials confirmed.
At least 123 people have been infected, most linked to two small towns -- Colorado City, Arizona, and Hildale, Utah -- where residents often move between the two communities.
Within recent weeks, cases have also appeared in nearby Utah cities of Hurricane and St. George, after exposures in hospitals and urgent care clinics, the Southwest Utah Public Health Department reported.
Many of the clusters started in schools, department spokesperson David Heaton told NBC News. "But now we have community spread," he added.
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