Since measles began spreading in Arizona last summer, the majority of the state’s cases have been in a remote area of Mohave County. But this week, most new cases in the state were in Arizona’s most populous county, Maricopa.
There were four new measles cases confirmed in the Valley this week, according to the Maricopa County Department of Public Health — that’s the highest weekly case count in the county so far this year. Meanwhile, Mohave County added just one new case.
Maricopa County health officials say the extremely contagious disease is spreading throughout the community and have warned of recent possible public exposures at a youth basketball game in Mesa and several public sites in Queen Creek.
A new case was also reported this week in neighboring Pinal County. In that case, the infected individual visited a health care facility and officials are working to contact people who may have been exposed, according to the Pinal County Public Health Services District.
In total, Arizona has reported 306 measles cases since June 2025, and 22 of those cases have led to hospitalizations, according to the Arizona Department of Health Services.
Dr. Maria Merrick, assistant medical director for the Maricopa County Department of Public Health, said vaccination offers the best protection against measles.
“Measles remains extremely, highly contagious and 90% of people who aren’t vaccinated will get sick if they are exposed,” Merrick said. “[Arizonans should] take the time to reconsider if they aren’t immunized to get immunized.”
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