The city reported that it had discovered its first West Nile-positive mosquito for the 2025 season in early July. The Daily ...

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 ...

Colorado's first case of West Nile virus in 2023 has surfaced in La Plata County, according to a Monday news release from the Colorado Department of Public Health and Environment ...

In Arizona, mosquito-borne viruses are most likely spread from May through October during the peak of mosquito activity.