West Nile, Kern County
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Three dead birds in Sacramento County were found to have contracted the virus as activity ramped up in Placer County.
West Nile virus has been confirmed for the first time this summer among mosquitoes in Macomb County, health officials said.
West Nile virus has been detected in San Diego County after two dead crows found in Lemon Grove tested positive.
West Nile Virus has been detected in a single sampling of mosquitoes that were collected in Macomb County, health officials announced.