West Nile virus: 3 counties confirm first positive mosquitoes of 2025

DENVER (KDVR) — Boulder County Public Health, Weld County and the city and county of Broomfield have confirmed within two days that there have been the first positive tests of West Nile virus in mosquitoes in those areas.

In a press release on Tuesday, the Boulder County health department said that the positive mosquitoes were collected last week from a trap site in Niwot East; however, there have been no other positive tests in other areas of the county thus far.

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“We’ve seen low numbers of mosquitoes so far, but we expect them to increase as the season goes on,” said Marshall Lipps, environmental health specialist at Boulder County Public Health, in the release. “However, West Nile virus transmission risk still exists in Boulder County and surrounding areas, and we encourage the community to take personal precautions to prevent mosquito bites. Finding a positive mosquito in one location doesn’t mean the risk is limited to that area. West Nile virus can still be present anywhere across the county.”

Weld County said in a press release on Monday that following tests in three different zones, two of those zones found positive tests from mosquitoes. The two zones that tested positive included the municipalities of Greeley, Evans, Kersey, LaSalle, Johnstown, Milliken and Platteville…

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