While there have been no confirmed human cases, residents are encouraged to take steps to prevent infection
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(Hamilton County, Oh.) - Hamilton County Public Health has confirmed mosquitoes in Hamilton County have tested positive for West Nile virus.
As part of a standard operating procedure, Hamilton County Public Health traps mosquitoes throughout the county and sends them to the Ohio Department of Health for testing. This provides HCPH with a vital tool for assessing the region’s threat of West Nile virus.
On August 26, HCPH learned that mosquitoes our agency had trapped in Green Township on July 30 tested positive for carrying West Nile virus. This was the first time in 2026 that West Nile virus was detected in mosquitoes within HCPH’s jurisdiction (all of Hamilton County, Ohio, except for Cincinnati, Springdale and Norwood).
At this time, there are no confirmed human cases. Here's what residents and visitors can do to prevent infection:
- Eliminate standing water around your home.
- Use mosquito larvicide (“dunks”) in water that can’t be drained.
- Protect yourself with EPA-registered repellent, long sleeves and light-colored clothing.
- Avoid outdoor activity during peak mosquito times, especially dusk and dawn.
Get more tips and download our fact sheets at bit.ly/HCPHWestNile2026.
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