SALEM -- Health officials say West Nile virus has been found in Oregon mosquitoes for the first time in 2013.
An Oregon State lab detected it last week in samples from the Harper-Little Valley area of Malheur County.
Most West Nile infections are mild, but Oregon health officials say the virus can cause severe symptoms such as encephalitis. It is rarely fatal.
No human cases have been reported in Oregon so far this year. Last year, 12 were identified.
Malheur County Health director Stephanie Dockweiler says mosquitoes have begun to show up after a mild winter and warm spring.
Health officials say protective measures include eliminating standing water, using repellent, wearing long-sleeve shirts and long pants, and repairing doors and screens for tight fits.