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Utah Measles Cases Exceed 680 Since June 2025 Outbreak Began
Utah has recorded more than 680 measles cases since the outbreak started on June 20, 2025. The virus has reached 22 of the state's 29 counties, with the largest clusters in the southwest and northeast regions.
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Utah has recorded more than 680 measles cases since the state's first outbreak began on June 20, 2025. The virus has spread across 22 of the state's 29 counties, with the largest clusters in the southwest and the rural northeast tricounty region. Statewide, 12.8 percent of kindergarteners were missing their measles vaccine during the last school year, below the 95 percent threshold needed to prevent outbreaks.
In the tricounty region, more than 16 percent of kindergarteners lacked the vaccine.
The outbreak has been difficult to contain to one area. Cases appeared in healthcare settings, stores, restaurants, and youth sporting events. An exposure at a state high school wrestling championship in February led to at least 46 additional cases.
Health officials in the tricounty region reported 74 cases this spring after the wrestling tournament. Officials excluded unvaccinated students from in-person classes and directed sick individuals to isolate. Local staff also encouraged residents to get vaccinated.
Utah's outbreak will factor into a November review by international health experts on whether the United States retains its measles elimination designation. The national case count reached 2,104 as of June 18. Canada lost its measles elimination status last year.
Most of Utah's recent cases have originated within the state rather than from external sources. State epidemiologist Leisha Nolen stated that transmission continues despite the recent slowdown in new cases. Officials expect school reopenings and colder fall weather could increase spread again.
