Colorado’s West Nile virus season is kicking off earlier than usual, raising concerns about the potential severity of the mosquito-borne illness. Denver recently reported its first mosquito testing positive for West Nile, marking the second Front Range county to confirm virus presence this season.
While not all counties conduct mosquito trapping, residents should remain cautious as the virus can still be present in their local mosquito population. Standing water from recent storms provides breeding grounds for mosquitoes, but other factors such as temperature and bird infections also play a role in the virus’s spread.
Dr. Daniel Pastula from the University of Colorado School of Medicine emphasizes the unpredictable nature of West Nile outbreaks, making it crucial for residents to stay informed and take precautions. Mosquito traps set up by counties serve as early warning signs for increased virus risk, prompting people to be vigilant in avoiding mosquito bites.
West Nile season in Colorado typically peaks between July and September, with the virus remaining active until the first snowfall. While most cases are mild or asymptomatic, severe infections can lead to neurological complications or even death. Certain demographics, such as individuals over 50 or with underlying health conditions, are at higher risk of developing severe West Nile symptoms.
To protect against mosquito bites, experts recommend using insect repellent, wearing protective clothing, and avoiding outdoor activities during peak mosquito hours. Additionally, eliminating standing water sources and using screens on windows can help prevent mosquito breeding on personal property.
With the potential for severe consequences from West Nile virus, taking preventive measures is essential for safeguarding public health.
For more health news and updates, sign up for our weekly newsletter to stay informed.
Originally Published: July 3, 2025 at 11:46 AM MDT
