West Nile virus in California

Number of confirmed human cases of West Nile virus, and deaths attributed to the virus, by county in California so far in 2025. Click or hover on a county for details.

Map showing human cases of West Nile virus by county in California so far in 2025.

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Figures represent human infections of West Nile virus and deaths from the disease through Sept. 25, 2025 (Kings County through Oct. 2, 2025).

Chart: Tim Sheehan / Central Valley Journalism CollaborativeSource: California Department of Public Health; U.S. Centers for Disease Control; individual county health departmentsCreated with Datawrapper