An adult in Lafayette is the first human death of West Nile virus in Colorado this year, according to the Colorado Department of Public Health and Environment.

In the latest weekly update of mosquito activity, Mosquito Control’s entomology lab reported that Culex tarsalis mosquitoes — the species most responsible for human transmission of West Nile virus — are active in some of the highest numbers recorded this early.

Colorado recorded its first human death of the year from West Nile virus on Friday. The case was in an adult from Lafayette. That's according to the state health department and Boulder County Public Health, in a press release.