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 Licking County has reported 65 cases. In northeast Ohio, Stark County has logged 59 cases, and Summit County has reported 27.
Health officials warn that the increase underscores the importance of prevention. The Ohio Department of Health urges residents to:
- Wear long sleeves and pants when in grassy or wooded areas.
- Use EPA-approved insect repellents.
- Check yourself, children, and pets for ticks after being outdoors.
- Remove ticks promptly and safely to reduce the risk of infection.
Lyme disease, spread through the bite of infected blacklegged ticks, can cause fever, fatigue, rash, and joint pain. If left untreated, it can lead to severe complications affecting the nervous system and heart.
The state continues to monitor the spread and is urging residents to remain vigilant as summer outdoor activity peaks.
