BOISE -- Owyhee County is the fifth Idaho county to confirm mosquitoes that tested positive for West Nile virus.
Southwest District Health officials say mosquitoes collected in a trap in the Bruneau area have the virus.
Previously, Ada, Canyon, Gem, and Payette Counties in Idaho and neighboring Malheur County in Oregon had reported mosquitoes that tested positive.
Given the virus is in Idaho, health officials warn residents to take precautions to avoid being bitten.
That includes using appropriate repellent and wearing long sleeves and pants, especially at dawn and dusk when mosquitoes may be more active.
Idaho led the nation in West Nile cases in 2006, with 1,000 infections and 23 deaths.
Last year, there were three reported human cases and no deaths.
There's been one case in Twin Falls this year.