LARIMER COUNTY, Colo. (CBS4)– An increase in West Nile Virus cases has prompted spraying for mosquitoes in Larimer County.

Three people in the county were confirmed to have the virus and one was hospitalized.

Mosquito control trucks sprayed for mosquitoes north of Fort Collins city limits on Thursday night. Crews will spray again in Monday night.

The City of Fort Collins is also spraying for mosquitoes on Monday.