A fresh measles outbreak along the Utah–Arizona border has pushed the United States closer to losing its measles elimination status, once seen as a milestone of public health success. Here’s what is driving the resurgence. More than 100 people have been infected in the Utah–Arizona region since August 2025, making it the second-largest cluster of measles cases in the US this year. Most infections are among unvaccinated individuals, and the virus has spread beyond small religious communities into the broader population. The outbreak follows the earlier “Southwest wave” that sickened over 880 people across Texas, New Mexico and Oklahoma, pushing national measles cases to a 34-year high. Experts warn that the situation resembles the large outbreaks of the early 1990s, before vaccinati

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