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Latest West Nile Virus Activity in California

Last Updated: May 22, 2020 2:56pm PST
Data is updated on Fridays by 4pm.

Due to different reporting schedules, case totals on this website may not always be consistent with those reported by local health departments.
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Total Counties with WNV in 2020: 2
Napa, and Santa Clara.

Human Cases: 0 YTD

YTD: 0 Counties: 0
No cases of human WNV illness have been reported positive for WNV in 2020.

Horses: 0 YTD

YTD: 0 Counties: 0
No horses have tested positive for WNV in 2020.

Dead Birds: 5 YTD

YTD: 5 Counties: 2

5 dead birds from 2 counties have tested positive for WNV in 2020.

Mosquito Samples: 0 YTD

YTD: 0 Counties: 0
No mosquito samples have tested positive for WNV in 2020.

Sentinel Chickens: 0 YTD

YTD: 0 Counties: 0
No sentinel chickens have tested positive for WNV in 2020.

View all Case Counts by County