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

West Nile virus has been found in Boulder County. Boulder County Public Health confirmed that, last week, mosquitoes trapped on the east side of Niwot tested positive for West Nile.

A Lafayette man has been diagnosed with West Nile virus, making him the first confirmed human case of the mosquito-borne infection in Boulder County for 2023. Skip to content.

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

A Longmont resident has died from meningoencephalitis caused by West Nile virus, the Boulder County Public Health department confirmed Tuesday. The resident is the first in the county to die from ...

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.