Last modified: July 16, 2026
July 16, 2026• byJeffco HealthDept
On July 15, adult mosquitoes collected from two trap sites in the city of Arnold tested positive for the West Nile Virus. Officials in the city have been notified of the positive results. The Jefferson County Health Department (JCHD) conducts surveillance in this area but does not have jurisdiction for control. With this stated, JCHD’s Mosquito Control and Surveillance program will continue to monitor mosquitoes for the West Nile Virus throughout the county.
The Jefferson County Health Department asks that residents remain diligent in protecting themselves and their families from mosquitoes. Residents should continue using insect repellents approved by the Environmental Protection Agency (EPA) that contain one of the following active ingredients:
Whenever possible, residents should wear clothes that cover exposed skin to reduce the risk of being bitten. Residents can also reduce the number of mosquitoes around their home and property by getting rid of all standing water at least 1 time per week and scrub out any containers that were holding standing water.
For more information about the JCHD Mosquito Control and Surveillance Program, preventing mosquito-spread diseases, or mosquito control, please visit www.jeffcohealth.org
Last modified: July 16, 2026
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