The city of Denver’s health department has confirmed a human case of West Nile Virus (WNV), its first for the year. Jefferson County also reported its first cases, with three residents recovering at home. According to James Rada, Jefferson County Environmental Health Director, most people who contract WNV do not display symptoms, but some can become severely ill or even die.
The virus is primarily spread through mosquito bites, and its transmission occurs anytime mosquitoes are active. Colorado typically sees more cases during summer and fall, with the season ending with the state’s first hard freeze.
Common symptoms of WNV include fever, fatigue, headaches, and body aches, often appearing three days to two weeks after being bitten by an infected mosquito. People over 50 or those with weakened immune systems are at higher risk for severe illness.
To prevent WNV, Denver residents can take several steps:
* Drain standing water where mosquitoes breed
* Avoid watering cement or streets that create puddles
* Use insect repellents like DEET when used as directed
* Limit outdoor activity during peak mosquito hours (dawn and dusk)
* Wear long sleeves and pants outside
Historically, Colorado has reported dozens of deaths and hundreds of hospitalizations due to WNV. While this year’s cases are fewer than in previous years, the state is still experiencing outbreaks.
No specific treatment for WNV exists, but consulting healthcare providers immediately can help ease symptoms and aid recovery if symptoms appear.
Source: https://denverite.com/2025/08/04/west-nile-virus-denver-human-case