West Nile Virus in California
California has no recent West Nile Virus activity, but 14 alerts have been recorded historically.
Risk Level
🟢 Low
No cases reported in the past 30 days
Cases (30 days)
0
Total Cases
14
Counties Affected
12
Most recent West Nile Virus alert in California: Jun 16, 2026
West Nile Virus Alerts in California
San Luis Obispo, California
Jun 16, 2026 · active
1
confirmed
Sacramento, California
Sep 30, 2025 · active
1
confirmed
Sacramento, California
Sep 30, 2025 · active
1
confirmed
Yolo, California
Sep 24, 2025 · active
1
confirmed
Stanislaus, California
Sep 18, 2025 · active
1
confirmed
Contra Costa, California
Sep 17, 2025 · active
1
confirmed
Santa Barbara, California
Sep 2, 2025 · active
1
confirmed
Tehama, California
Oct 11, 2024 · active
1
confirmed
Los Angeles, California
Sep 9, 2024 · active
1
confirmed
San Diego, California
Aug 26, 2024 · active
1
confirmed
San Joaquin, California
Aug 14, 2024 · active
1
confirmed
Sacramento, California
Aug 3, 2024 · active
1
confirmed
Yuba, California
Jul 29, 2024 · active
1
confirmed
Placer, California
Jul 26, 2024 · active
1
confirmed
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