The number of measles cases in Utah and in parts of neighboring Arizona are increasing, according to the latest reports from state and local health officials.
The Utah Department of Health & Human Services said on its website that as of Monday, 36 state residents have come down with measles this year. The first spate of cases began the week of June 8 and ended the week of July 13, while the second set of cases started the week of Aug. 10 and is still ongoing.
The vast majority of Utah measles cases, 25, are concentrated in southwest Utah; seven in Utah County, three in the southeast Utah and one in the “Bear River” jurisdiction, per the Utah Department of Health & Human Services measles dashboard.
Only one of the 36 measles patients in Utah in 2025 was vaccinated against it, with the other 35 all confirmed to be unvaccinated against measles, Utah health officials said.
In Arizona, there have been 46 measles cases in 2025 as of last Wednesday. Four of the cases occurred in Navajo County as part of an outbreak that is no longer ongoing, the Arizona Department of Health Services said on its website.
The other 42 occurred in Mohave County, which borders Utah’s southwest health jurisdiction, as part of an active outbreak, Arizona health officials said. The outbreak started during the week of Aug. 3.
Arizona officials did not break down the cases by the vaccination status of the patients.
National, state and local health officials recommend that people take the measles, mumps and rubella vaccine. One dose of the vaccine is 93% effective at preventing someone from contracting measles, while two doses are 97% effective, according to the Centers for Disease Control and Prevention.
• Brad Matthews can be reached at bmatthews@washingtontimes.com.
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