Maricopa County Records 15 Measles Cases, Largest Outbreak in 30 Years
Updated
Updated · ABC15 Arizona in Phoenix · May 16
Maricopa County Records 15 Measles Cases, Largest Outbreak in 30 Years
6 articles · Updated · ABC15 Arizona in Phoenix · May 16
15 confirmed measles cases have made 2026 the worst outbreak in Maricopa County in three decades, with officials saying community transmission is underway.
11 potential exposures have been linked to the outbreak traced to April 23, including two key exposure events at Arizona Athletic Grounds in southeast Mesa on April 23 and May 5-7.
Below-90% vaccination rates in the Phoenix metro area are driving concern that the virus could keep spreading, county and hospital officials said.
More than 95% vaccine efficacy with two doses remains the main defense, while unvaccinated residents were told to watch for symptoms and isolate for 14 days if they appear.
With a highly effective vaccine, why is a preventable disease making its biggest comeback in 30 years?
Beyond health risks, what is the full economic cost when a preventable disease returns to a community?
Measles Returns to Maricopa County: 2026 Outbreak Exposes Vaccine Gaps and Public Health Challenges
Overview
Maricopa County is facing a significant measles outbreak, with cases reaching levels not seen since 1996. The outbreak is mainly concentrated in the East Valley, especially in Mesa, Queen Creek, and Gilbert, where most exposure sites have been identified. This localized spread suggests specific transmission chains in these communities. In response, the Maricopa County Department of Public Health is actively notifying the public about potential exposure sites to help people take protective measures. The situation highlights the importance of public health communication and targeted interventions to control the spread of measles in affected areas.