A Culex tarsalis mosquito resting on human skin, shows the dark-scaled proboscis which has a broad median white band on September 20, 2005. The Culex tarsalis can spread Western Equine Encephalitis (WEE), St. Louis Encephalitis (SLE), and California Encephalitis, and is currently the main vector of West Nile virus in the Western United States. (James Gathany/Centers for Disease Control via Bay City News)

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

A group of mosquitoes collected from a trap in Knightsen, a community in eastern Contra Contra, are the first mosquitoes to test positive for the virus this year in the county, the county’s mosquito and vector control district said on Thursday.

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