Most West Nile cases in Colorado happen between July and September, though mosquitoes can live until the first snow or hard ...

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

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

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

The state’s West Nile virus season appears to be ahead of schedule this year, after two more Colorado counties detected the ...

Mosquitoes are a familiar nuisance each summer when you are trying to enjoy the outdoors. Unfortunately, some mosquitoes can ...

DENVER ( KDVR) — The first trace of the West Nile virus this season was found in Denver through a positive mosquito sample.

In July 2003, Petersen was chatting with a neighbor after work about West Nile. Birds had been dropping dead that year at a nearby lake, which Petersen said indicated the virus had arrived.

It's officially West Nile virus season in Larimer County, with the first mosquitoes of the season testing positive.

Colorado's West Nile virus season is starting a bit early, but experts aren't sure whether a wet spring will translate into a tough year for the mosquito-borne illness.