Weld County officials announced on July 7 that mosquito samples collected from two of the county’s three designated trap zones have tested positive for West Nile Virus (WNV). The affected areas include Greeley, Evans, Kersey, and LaSalle (Zone One), as well as Johnstown, Milliken, and Platteville (Zone Two).Mosquitoes from the third trap zone—covering Firestone, Dacono, and Fort Lupton—tested negative for the virus.Though no human cases have been reported in the county so far this year, health officials are warning residents to be prepared. With the arrival of hotter temperatures in July and August, Culex mosquitoes—the primary carriers of WNV—become more active and more numerous.“A Permanent Summer Presence”Jason Chessher, Executive Director of the Weld County Health Department, emphasized the seasonal nature of the virus. “The increasing hot weather often leads to favorable conditions for the Culex mosquito that carries West Nile Virus,” he said. “The public needs to be vigilant, because West Nile Virus has a permanent summer presence in Colorado.”What Are The Risks?Most people infected with WNV do not show symptoms, but those who do may begin to feel unwell three to 14 days after being bitten by an infected mosquito. Common symptoms include fever, headache, muscle aches, nausea, vomiting, weakness, and sometimes a rash.While these symptoms may resemble the flu, WNV can lead to more serious complications in some cases, particularly among older adults and those with weakened immune systems. There is currently no vaccine or specific antiviral treatment for WNV, which makes prevention especially important. Weld County health authorities recommend seeking medical care promptly if any symptoms arise.Steps to Stay SafeHealth experts advise residents to take proactive steps to reduce the risk of mosquito bites and virus transmission. These include:Eliminate standing water around your home, such as in birdbaths, flower pots, gutters, or pet bowls, as these are prime mosquito breeding grounds.Use insect repellent that contains DEET, picaridin, oil of lemon eucalyptus, IR3535, or para-menthane-diol.Avoid outdoor activity during dawn and dusk, when mosquitoes are most active.Wear protective clothing like long-sleeved shirts and pants if you are outside during these peak hours.Cases In The Past and PresentColorado saw a significant spike in WNV cases in 2023, recording 631 infections, 398 hospitalizations, and 51 deaths—the highest in the country that year. In contrast, 2024 has been comparatively mild, with just 76 reported cases statewide, 24 hospitalizations, and no fatalities to date.Still, with Culex mosquito populations on the rise, officials say it’s crucial not to let your guard down. Weld County will continue monitoring mosquito activity closely and urges the community to follow safety guidelines to help prevent the spread of West Nile Virus this summer.