A mosquito pool in northern Elko County has tested positive for West Nile virus.
The Nevada Department of Agriculture says the pool near Wildhorse Mountain is the second confirming the presence of the virus in the state so far this year.
The virus was detected in Churchill County on June 1st.
There have been at least 183 confirmed cases of Nevadans infected with the virus since it was detected in the state in 2003. Cases have occurred in all 17 counties, and Nevada's first death was reported last year.
Officials say the positive tests come three weeks earlier than last year.
West Nile is spread by mosquitoes.
Health officials say the best way to protect against the virus is to wear insect repellent and long sleeves and pants when mosquitos are most active at dawn and dusk.
Officials also say to remove any standing water where mosquitoes might breed and to make sure window screens are intact and fit properly.
(Copyright 2007 by The Associated Press. All Rights Reserved.)