Boulder County Public Health confirmed that, last week, mosquitoes trapped on the east side of Niwot tested positive for West ...

Boulder County Public Health and Weld County both confirmed within two days that there have been the first positive tests of ...

Boulder County Public Health confirmed that, last week, mosquitoes trapped on the east side of Niwot tested positive for West Nile. No other testing sites returned positive results.

Weld County had 15 reported cases of human West Nile virus, according to the website. The year before reached 52 cases.

Mosquitoes collected by the Allegheny County Health Department tested positive for West Nile virus in six areas Tuesday.

Allegheny County Health Department officials announced mosquitoes collected in certain parts of the county earlier this month ...

Sheridan County Weed and Pest Control District has detected West Nile virus in mosquitoes in Sheridan County. To date, West ...

Mosquitoes carrying the virus were first identified in Colorado in 2003. That year resulted in the most human cases of West ...