DENVER (KKTV) -Colorado public health officials shared Tuesday that the first human cases of West Nile virus of 2025 had been confirmed in two Adams County residents.
According to the Colorado Department of Public Health & Environment (CDPHE), mosquitoes carrying West Nile have been identified in Adams, Boulder, Denver, Larimer and Weld counties.
State health officials said the highest risk of West Nile virus transmission in Colorado is from July through September and said when the virus begins to show up in mosquitoes in an area, people in that area should start to take precautions. CDPHE said those precautions include the following:
- Using insect repellent with DEET, picaridin, IR3535, oil of lemon eucalyptus, or para-menthane-diol
- Limiting time outside at dawn and dusk, when mosquitoes that spread the virus are most active
- Wearing long sleeves, pants and socks in areas with mosquito activity and applying repellent to clothing
- Removing standing water from yards and gutters weekly, treating water that can’t be drained with Bti larvicide, and installing or repairing window and door screens
According to the state health department, most people infected with West Nile virus don’t develop symptoms, but the virus can cause serious, potentially life-threatening illness. Health officials said people over 60 and those with certain medical conditions are at greater risk of complications.
CDPHE said you should seek medical care if you experience fever, severe headaches or confusion after being bitten by a mosquito.
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