West Nile Virus Activity in the County - Orange County Mosquito and Vector Control District

West Nile Virus Activity in the County

Map showing West Nile virus activity in Orange County, CA, with data on mosquito samples, human infections, and positive dead birds.

WNV Data for 2025 WNV Data for 2024 WNV Data for 2023

Take a look at disease activity throughout California using the VectoSurv map! To experience the entire site, visit: VectorSurv.org

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West Nile Virus

West Nile virus (WNV) is spread by the bite of an infected mosquito and is endemic to Orange County.

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Residential Truck-Mounted Applications

Click here to view treatments in neighborhoods.