Officials are warning boaters and other outdoor enthusiasts visiting Contra Costa County's Delta area to take steps to prevent mosquito bites after a group of mosquitoes from Brentwood recently tested positive for West Nile Virus.
The mosquitoes were trapped near Garin Parkway and Sunset Boulevard, the Contra Costa Mosquito and Vector Control District said Monday.
"Several people last year contracted West Nile virus through mosquito bites they got while enjoying recreational activities in the Delta area," district scientific program manager Dr. Steve Schutz said in a statement.
Two chickens from a flock in Holland Tract also tested positive for the virus.
Officials are reminding visitors to the Delta to wear mosquito repellent with an effective active ingredient such as DEET, Picaridin or Oil of Lemon Eucalyptus.
County residents are also advised to drain sources of standing water that could serve as mosquito breeding grounds; make sure door and window screens fit tightly and are in good repair; vaccinate animals such as horses that are highly susceptible to West Nile Virus; and wear long sleeves and pants when outdoors in areas with mosquitoes.