Mosquitoes in two areas of Weld County have tested positive for West Nile virus, though no human cases have yet been reported in the county.

Mosquitoes in two Weld County zones have tested positive for West Nile Virus, though no human cases have been reported yet. Health officials urge precautions as mosquito activity increases with the summer heat.

Boulder County Public Health and Weld County both confirmed within two days that there have been the first positive tests of West Nile virus in mosquitoes in those counties.