Measles case confirmed in Tucson resident

Anyone who believes they may have been exposed to measles and is experiencing symptoms should: stay home and avoid contact with others; contact a healthcare provider or PCHD (520-724-7797) before seeking in-person care; and follow public health guidance to prevent further spread.

Measles is a highly contagious viral infection that can cause permanent damage or even death, especially for children under age 5. It is one of the most contagious illnesses but is preventable; vaccination remains the most effective protection, the health department says.

Also on Friday, public health officials announced they are investigating a measles cluster linked to a business in the unincorporated Maricopa County community of Aguila, along U.S. 60 about 90 miles northwest of downtown Phoenix, The Arizona Republic reports.

The cluster includes at least seven confirmed cases, the Maricopa County Department of Public Health said.

Maricopa County public health officials said they are working with the employer and local partners to respond, The Republic reports.

The cluster brings Maricopa County’s total number of measles cases in 2026 to 21 — significantly higher than the annual average of one case per year over the past 30 years.

Pima County reported three confirmed measles cases between New Year’s Eve 2025 and Jan. 28 this year.