COLUMBUS, Ohio — Lyme disease cases are climbing sharply across Ohio this year, according to new data from the Ohio Department of Health.

As of July 30, 2025 , more than 1,100 cases of Lyme disease have been reported statewide — a dramatic increase compared to the state’s average annual rate between 2015 and 2024.

Several counties in eastern and southern Ohio are seeing the highest spikes. Harrison County reported 21 cases so far this year, compared to an average yearly rate of 132.67 cases per 100,000 residents , one of the highest in the state. Belmont, Jefferson, Coshocton, Guernsey, and Muskingum counties also recorded dozens of new cases, making them some of the hardest-hit areas.

Central Ohio is not immune. Franklin County has seen 33 cases this year, while nearby

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