Case numbers have increased recently, likely in part to the return of many students to college campuses, but also in rural counties. The top 14 counties in terms of cases per 100,000 residents are rural, and eleven counties are currently level three: Putnam, Mercer, Montgomery, Butler, Hamilton, Clermont, Pike, Scioto, Delaware, Muskingum, Richland, and Ashland. In early COVID days, counties with the largest populations: Franklin, Cuyahoga, and Hamilton were continuously amongst the level three counties but, due to swift action, have now reduced exposure.
Ohio State University and the Ohio Health Department conducted research in July and found that nearly 1% of the population had an active case of COVID-19, and 1.5% had antibodies indicating a previous coronavirus infection. The prevalence of cases in adult Ohioans is relatively low, only 0.9%, which corresponds to about 80,000 adults, had active infections, and 1.5%, which is about 130,000 adults, had evidence of antibodies during testing in July. However, this also means that Ohioans are still very susceptible to the virus.