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Home / Local News / First Ross County Positive Human Case of La Crosse Virus Reported

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First Ross County Positive Human Case of La Crosse Virus Reported

October 2, 2025 Mike Smith

Article Presented By Classic Brands…

(Chillicothe) – The first positive human case of La Crosse virus in 2025 has been reported in Ross County. “La Crosse virus is spread to humans by the bite of an infected mosquito,” explains Ross County Health District (RCHD) Public Health Nursing (PHN) Director, Morgan Kelley. While it is possible for some to develop severe disease, most people infected with the virus do not have symptoms. “It cannot be spread from person to person. The people most commonly susceptible to serious disease are under the age of 16,” Kelley adds.

“The mosquito that transmits La Crosse virus is the Eastern Treehole mosquito (Aedes triseriatus),” explains Kelly Spindler, RCHD Director of Environmental Health (EH). “They not only lay their eggs in tree holes, but also in artificial containers with water. Scrap tires are a common breeding site for many types of mosquitoes, including the Eastern Treehole mosquito,” she states.

“Limiting mosquito breeding ground sites is crucial to the prevention of mosquito-borne illnesses,” continues Spindler. “Our annual tire drive is coming up on Saturday, October 11 at the Ross County Fairgrounds. This is a great opportunity for the community to remove unwanted tires from their property while reducing those mosquito breeding sites. This event is free to all Ross County residents. We will accept up to 10 car tires, rimless only, per vehicle,” says Spindler. 

“The best ways to protect yourself from mosquito-borne illnesses and reduce the mosquito population include following the Dress, Dump, and Defend model,” encourages Spindler. “Dressing in long pants and long sleeves whenever possible limits exposed skin for mosquitoes to bite. You can help defend yourself from bites by using insect repellent containing any one of the following EPA-approved ingredients: Picaridin, DEET, oil of lemon eucalyptus (or PMD), or IR3535. Dumping out any standing water around your home weekly can significantly limit mosquito breeding grounds around your home,” concluded Spindler.

The 2025 RCHD Tire Drive and Flu Shot Clinic will be held on Saturday, October 11th from 8am to 12pm at the Ross County Fairgrounds. The event is first come first serve for Ross County residents only.  A limit of 10 car tires per vehicle of rimless car tires only will be accepted. For more tire drive event information, contact our Environmental Health office at (740) 775-1158. If you are interested in getting a flu shot at the event, please bring your ID and insurance card. For flu shot clinic questions, contact Public Health Nursing at (740) 775-1146. Tire drive event funding is provided by Ross County Litter Control & Solid Waste District’s Community Cleanup Grant.

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