The Ohio Department of Health has declared the state's third measles outbreak of 2026, involving four confirmed cases across two counties. Three of the patients live in Ashtabula County in the state's northeast corner, and one lives in Tuscarawas County, roughly 100 miles south. Their ages range from 4 to 30. All four were unvaccinated.
An outbreak is defined as three or more related cases, which means the state has determined these infections are linked rather than separate importations. The geographic spread between the two counties is the detail that will shape the coming weeks, because linked cases separated by that distance imply travel or gathering exposure rather than a single household.
