Mosquitoes found south of Lake Mary Road in Flagstaff have tested positive for West Nile virus, according to Coconino County Health and Human Services.
These are the first positive mosquitoes found in the county this year, but officials warn the virus could be present in other areas throughout the county.
County staff have used non-toxic larvicide on water pools near the source of these mosquitoes and other locations throughout the county, and will continue to trap and test mosquitoes throughout the region until colder weather arrives.
The county has not had any known human cases since two were reported in 2010. There is no specific treatment for the virus in humans other than supportive care; vaccines are available for horses, but not for humans.
Insect repellent containing DEET, Picaridin, Oil of Lemon Eucalyptus and IR3535 can provide reasonably long-lasting protection.
To prevent mosquito bites, stay indoors during dusk and dawn -- when these insects are most active -- or wear clothing that covers the skin when outdoors, use screens on windows and doors and repair any screen holes, use air conditioning indoors and clean out outdoor items that hold water (tires, buckets, planters, toys, pools, birdbaths, flowerpots or trash containers) once a week.
County officials advise residents to continue these measures until cold weather returns in the fall and mosquito activity lowers.