West Nile Virus in Ontario
As of September 2026, Ontario has 2 West Nile Virus alerts in the past 30 days (2 confirmed cases).
Risk Level
🟡 Moderate
Isolated cases — monitor the situation
Cases (30 days)
2
Total Cases
23
Counties Affected
15
Most recent West Nile Virus alert in Ontario: Sep 9, 2026
West Nile Virus Alerts in Ontario
Regional Municipality of Durham, Ontario
Sep 9, 2026 · active
1
confirmed
District of Parry Sound, Ontario
Aug 31, 2026 · active
1
confirmed
Simcoe, Ontario
Aug 6, 2026 · active
1
confirmed
Grey, Ontario
Oct 23, 2025 · active
1
confirmed
Grey, Ontario
Oct 10, 2025 · active
1
confirmed
District of Sudbury, Ontario
Sep 24, 2025 · active
1
confirmed
Regional Municipality of Peel, Ontario
Sep 22, 2025 · active
1
confirmed
District of Parry Sound, Ontario
Sep 9, 2025 · active
1
confirmed
Regional Municipality of Waterloo, Ontario
Sep 8, 2025 · active
1
confirmed
Grey, Ontario
Aug 29, 2025 · active
1
confirmed
District of Algoma, Ontario
Aug 29, 2025 · active
1
confirmed
Regional Municipality of Waterloo, Ontario
Aug 15, 2025 · active
1
confirmed
Middlesex, Ontario
Oct 24, 2024 · active
1
confirmed
Hastings, Ontario
Oct 23, 2024 · active
1
confirmed
District of Thunder Bay, Ontario
Oct 15, 2024 · active
1
confirmed
Dufferin, Ontario
Oct 11, 2024 · active
2
confirmed
District of Thunder Bay, Ontario
Oct 1, 2024 · active
1
confirmed
Lambton, Ontario
Sep 17, 2024 · active
1
confirmed
District of Sudbury, Ontario
Sep 16, 2024 · active
1
confirmed
United Counties of Prescott and Russell, Ontario
Sep 3, 2024 · active
1
confirmed
Simcoe, Ontario
Sep 3, 2024 · active
1
confirmed
Norfolk, Ontario
Aug 21, 2024 · active
1
confirmed
Get alerted about West Nile Virus in Ontario
We'll email you whenever a new equine disease outbreak is reported in Ontario. Unsubscribe anytime.