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LOUISVILLE, Ky. (WDKY) – One Kentucky health department has announced it has found mosquitoes with West Nile virus.

WDRB reports the Louisville Metro Department of Public Health and Wellness found mosquitoes in surveillance traps in three of the city’s zip codes that were infected.

There are no reported human cases at this time. Most people infected show no symptoms, but approximately one in five will develop a fever along with other symptoms. A rare number of people can experience more significant symptoms.

People 60 and older or people with medical conditions are at the greatest risk.

Health experts ask the public to use repellant to help prevent mosquito bites. Wearing long-sleeve clothing and socks also helps prevent bites.