Three new cases linked to the East Valley outbreak were reported, with recent exposure sites concentrated in Mesa after earlier ones in Gilbert and Queen Creek.
County officials said 96% of local cases are in unvaccinated people; statewide, Arizona has recorded 311 cases since 2025, 24 hospitalisations and no deaths.
The county's highest measles tally since at least 2006 has more than doubled from six in mid-April, as officials urge people to monitor symptoms for 21 days and check vaccination status.
With no travel link, what is the true source driving Mesa’s alarming measles community spread?
Could Arizona's local outbreak cost America its 26-year measles elimination status this November?
As vaccine exemptions rise, are schools prepared for the return of once-vanquished childhood diseases?