CARSON CITY, Nev. (AP) — State agriculture officials say more mosquito pools have tested positive for West Nile virus in northern Nevada.
Test pools in Douglas County confirmed the presence of the virus earlier this month.
Officials say infected mosquitoes have since been confirmed in Washoe County, Carson City and the Mason Valley area of Lyon County.
Veterinarians recommend horse owners update their animals' West Nile vaccinations.
There is no vaccination for humans. Health officials urge people to use insect repellant and to wear pants and long sleeves when mosquitoes are active.
They also recommend removing any standing water that can be used as breeding grounds and making sure window screens are intact to prevent mosquitoes from getting inside.
©2013 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.