West Nile Virus in Wisconsin
As of September 2026, Wisconsin has 1 West Nile Virus alert in the past 30 days (1 confirmed case).
Risk Level
🟡 Moderate
Isolated cases — monitor the situation
Cases (30 days)
1
Total Cases
15
Counties Affected
9
Most recent West Nile Virus alert in Wisconsin: Sep 4, 2026
West Nile Virus Alerts in Wisconsin
Brown, Wisconsin
Sep 4, 2026 · active
1
confirmed
Green Lake, Wisconsin
Oct 23, 2025 · active
1
confirmed
Grant, Wisconsin
Oct 14, 2025 · active
1
confirmed
Croix, Wisconsin
Sep 17, 2025 · active
1
confirmed
Clark, Wisconsin
Sep 12, 2025 · active
1
confirmed
Grant, Wisconsin
Sep 9, 2025 · active
1
confirmed
Iowa, Wisconsin
Oct 9, 2024 · active
1
confirmed
Clark, Wisconsin
Sep 19, 2024 · active
1
confirmed
Green Lake, Wisconsin
Sep 16, 2024 · active
1
confirmed
Washington, Wisconsin
Sep 13, 2024 · active
1
confirmed
Walworth, Wisconsin
Sep 12, 2024 · active
1
confirmed
Marquette, Wisconsin
Sep 6, 2024 · active
1
confirmed
Marquette, Wisconsin
Aug 30, 2024 · active
1
confirmed
Clark, Wisconsin
Aug 23, 2024 · active
1
confirmed
Marquette, Wisconsin
Aug 20, 2024 · active
1
confirmed
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