Colorado’s first West Nile Virus-related death of 2025 has occurred, involving a Boulder County resident. Denver Gazette reports that the adult who died was from Lafayette.

It’s also worth noting that nine other cases have been confirmed across eight counties thus far this year, though these cases have not proven fatal at this time. On average, about 10 to 11 Coloradans die each year due to West Nile Virus.

With 76 human cases of West Nile Virus confirmed in Colorado last year, that number was notably low – the lowest since the chaotic year of 2020 (35 cases) and down from 634 cases in 2023 and the 323 cases that have occurred each year on average since 2003. It’s also worth noting that while no one was killed by West Nile Virus in Colorado last year, the year before that – 2023 – saw 51 deaths related to the virus.

Most people who get bitten by a mosquito carrying West Nile Virus probably won’t even realize that they’re battling the associated disease due to lesser symptoms. That being said, people aged 60 and older, as well as those with certain medical conditions, face a greater chance of more serious symptoms after contracting the disease, including potential death.

Because of the prevalence of West Nile Virus in Colorado and how much time locals tend to spend outside, it’s crucial for all to take steps to remain safe during outdoor recreation. 

The Colorado Department of Public Health and Environment recommends utilizing insect repellent that contains DEET, picaridin, IR3535, oil of lemon eucalyptus, or para-menthane-diol when spending time outside. It’s also recommended that Coloradans avoid being outside during times when mosquitos are most active – dusk and dawn. Wearing clothing that covers exposed skin can also be an effective deterrent.

The first noticeable symptoms of West Nile virus tend to be severe headaches and confusion. Consult with your health care provider immediately if you notice these symptoms popping up.

Explore more data related to the West Nile Virus and Colorado here.