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 ...

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

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

Shasta County Mosquito and Vector Control found 2025's first mosquitoes carrying West Nile Virus in the county. Here's how to reduce bites.