An alarming increase in cases of West Nile Virus cases has lead authorities to conduct mosquito spraying in Larimer County, Dispatch Times reports.

Mosquito control trucks sprayed north of Fort Collins city limits this week and will spray again on Monday night. Authorities will also conduct mosquito spraying in the City of Fort Collins on Monday.

Three people in the county were detected to be suffering from West Nile Virus. One of the patients is hospitalized.

The first human cases of West Nile Virus have been detected in Kern, Orange, San Bernandino, and Santa Clara counties this year. The officials have found the presence of culex tarsalis mosquitoes in the region that may carry West Nile virus.

Officials are urging the residents of the area to take precautions against mosquitoes by spraying DEET and other forms of mosquito repellants, wearing loose and long sleeved clothing or trousers, and if possible, to avoid being outside their homes during dusk and dawn when since mosquitoes' activity is at its peak during these hours.

According to Dispatch Times, David Schmidt, West Nile coordinator for Lancaster and Lebanon counties, said in an email that mosquito samples that were collected this month from several parts of the city have tested positive for West Nile Virus.