2 Contra Costa County Residents Infected With West Nile Virus Two Contra Costa County residents recently tested positive for the West Nile Virus. They are the fourth and fifth human cases of the virus confirmed in the county this year.
‘Hot Spots’ Sprayed After 2nd West Nile Case Reported In CoCo CountyAnother human case of West Nile Virus has been confirmed in Contra Costa County according to health officials, bringing the tally up to two known infections.

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