Overview
- The health department, which confirmed three linked cases Wednesday, reported no travel history or known source and said the infections were likely caught in the county.
- Officials posted public exposure sites in Mesa, including a church, grocery stores, a Target, and several restaurants, and advised people who were there during listed times to watch for symptoms through May 10 to May 24.
- People who are unvaccinated or unsure of their measles, mumps, and rubella status should check records and call a doctor before seeking care if symptoms like fever, cough, red eyes, or a blotchy rash appear.
- The 13 confirmed cases are the county’s highest yearly total since at least 2006, according to Arizona Department of Health Services data.
- Statewide context shows 311 measles cases since 2025, with many concentrated in Colorado City and most occurring in people who were not vaccinated.