The Utah measles case count has increased to 44 confirmed cases in 2025, marking a significant rise amid a broader outbreak affecting southwestern Utah and neighboring Arizona.
Current Outbreak Status and Regional Spread
According to the Utah Department of Health and Human Services, there were no confirmed measles cases in Utah in 2024, but the 2025 outbreak started with a case reported in May linked to travel. As of late September, 30 of Utah’s 44 cases have been reported in the southwest region near the Arizona border, where Arizona has experienced 59 cases, mainly concentrated in Mohave County. This outbreak, spanning northern Arizona and southwest Utah, is among the largest in the United States currently.
Other Utah cases are distributed across northern Utah, southeast Utah, and Utah County. Public health officials have identified several exposure sites and are advising residents who visited these locations during exposure periods to monitor for symptoms.
Wastewater Surveillance and Public Health Response
Innovatively, Utah health authorities have detected measles virus in wastewater samples across multiple health districts, indicating the virus is more widespread than case counts alone suggest. While wastewater testing confirms the presence of the virus, it does not specify the number of infected individuals shedding the virus in each area.
The state is maintaining ongoing symptom-watch periods for individuals who may have been exposed, particularly noting recent exposures such as at the Budge Clinic in Logan. Health officials emphasize the importance of vaccination with the MMR vaccine to prevent further spread and urge residents to verify their immunization status, especially those attending large events or residing in affected areas.
Nationally, the measles outbreak situation remains serious with over 1,500 confirmed cases reported across the U.S. in 2025, with Utah’s outbreak contributing to the regional public health challenge.