The Denver Department of Public Health and Environment has confirmed its first human case of West Nile virus this season, while officials in Jefferson County have also reported three cases. Colorado has seen over a dozen cases of the virus so far, resulting in one fatality.
West Nile virus has been detected in mosquitoes in eight counties, including Adams, Arapahoe, Boulder, Broomfield, Denver, Jefferson, Larimer, and Weld. In Fort Collins, the infection rate is 11 times higher than average, with four times more cases reported than in 2023.
To prevent mosquito bites, residents are advised to eliminate standing water, empty and scrub containers weekly, and clean gutters. Wearing repellents, limiting outdoor activity during peak hours, and wearing protective clothing can also reduce the risk of infection.
Symptoms of West Nile virus include fatigue, fever, headaches, body aches, rashes, or swollen lymph nodes, often appearing within 3-14 days. Those over 50 or with weakened immune systems are at higher risk of developing serious symptoms. If symptoms occur, residents are urged to consult their healthcare provider immediately.
Source: https://www.cbsnews.com/colorado/news/denver-jefferson-county-west-nile-first-human-case-2025