West Nile Virus in Pennsylvania
As of September 2026, Pennsylvania has 3 West Nile Virus alerts in the past 30 days (3 confirmed cases).
Risk Level
🟡 Moderate
Isolated cases — monitor the situation
Cases (30 days)
3
Total Cases
29
Counties Affected
10
Most recent West Nile Virus alert in Pennsylvania: Sep 17, 2026
West Nile Virus Alerts in Pennsylvania
Lancaster, Pennsylvania
Sep 17, 2026 · active
1
confirmed
Union, Pennsylvania
Sep 17, 2026 · active
1
confirmed
Dauphin, Pennsylvania
Sep 17, 2026 · active
1
confirmed
Cumberland and Luzerne, Pennsylvania
Sep 12, 2025 · active
3
confirmed
Union, Pennsylvania
Sep 3, 2025 · active
6
confirmed
Washington, Pennsylvania
Oct 10, 2024 · active
1
confirmed
Dauphin, Pennsylvania
Sep 30, 2024 · active
1
confirmed
Northumberland, Pennsylvania
Sep 30, 2024 · active
1
confirmed
Montour, Pennsylvania
Sep 3, 2024 · active
1
confirmed
Cumberland, Pennsylvania
Aug 31, 2024 · active
1
confirmed
Union, Pennsylvania
Aug 28, 2024 · active
1
confirmed
Chester, Pennsylvania
Aug 27, 2024 · active
4
confirmed
Juniata, Pennsylvania
Aug 27, 2024 · active
2
confirmed
Lancaster, Pennsylvania
Aug 27, 2024 · active
5
confirmed
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