West Nile virus activity is on the rise in some northern California counties, according to the Sacramento-Yolo Mosquito and ...

A crow from Walnut Creek has tested positive for West Nile virus (WNV) in Contra Costa County, confirmed the Contra Costa ...

Northern California’s first human West Nile virus case of the year has been confirmed in Butte County, according to local ...

Insecticide will be sprayed from an airplane over a north Modesto community Friday night to combat a growing presence of ...

BUTTE COUNTY, Calif. — Health officials in Butte County have confirmed the first human case of West Nile Virus (WNV) this ...

There has been an increase in West Nile virus activity as more mosquito samples and dead birds have tested positive in recent ...

More signs of West Nile virus have cropped up this summer in Contra Costa County, this time in Knightsen, officials said. A ...

FRESNO COUNTY, Calif. (KFSN) -- The first human case of West Nile virus this year has been confirmed in Fresno County. The Fresno County Department of Public Health says the infection was identified ...

West Nile Virus infections generally fall into three categories. Eight in 10 people are asymptomatic, one in 5 experience mild to moderate symptoms, and less than 1 in 150 develop ...