Los Angeles County's first West Nile virus positive mosquito sample of the season was reported Monday, while vector control in Palm Desert also reported mosquito samples testing positive for WNV and St.

The Greater Los Angeles County Vector Control District said the mosquitoes were collected from a trap in Hacienda Heights, where populations of adult mosquitoes and tests groups of adult female mosquitoes are routinely monitored for the presence of WNV and other mosquito-borne viruses.

West Nile virus had also been discovered in mosquitoes collected from traps in Palm Desert, the Coachella Valley Mosquito and Vector Control District reports.

The late rainfalls coupled with warmer temperatures have contributed to increased mosquito activity in Southland communities, according to the Vector Control District.

Centers for Disease Control and Prevention recommends products with the active ingredients DEET, Picaridin, IR3535, or oil of lemon eucalyptus as being safe and effective, when used according to the labels, against mosquitoes that can transmit disease.