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.

The city reported that it had discovered its first West Nile-positive mosquito for the 2025 season in early July. The Daily Camera reported the news, saying that while West Nile virus season was starting early in Colorado's Front Range, experts weren't certain that this would translate into a heavy season for infections.

The risk of becoming infected with West Nile virus is high in Larimer County, the Larimer County Department of Health and Environment warns.

A Coloradan named James Martinez has been in the ICU for a week with West Nile virus after being bitten by a mosquito. His family is speaking out about what happened in hopes of warning others.

Two people in Adams County have tested positive for West Nile Virus, which has seen a significant increase in mosquitoes in the state. Dr. Lindsey Fish, Internal Medicine with Urgent Care at Denver Health,

All Colorado counties have reported at least one human case of West Nile virus since 2003. No one knows how many people have had the virus, because most don’t get sick. Related Articles

The type of mosquito which carries the West Nile Virus is flourishing, thanks to Colorado’s unusually wet spring and early summer which was followed by warm temperatures. And on the eve of one ...