Confirmed Case(s) – No Quarantine Source: attending veterinarian Number Confirmed: 1Number Exposed: 8Facility Type: Private Facility Horse 1: Age: Yearling; Gender: Filly; Breed: Quarter Horse (QH); Usage: young stock; Onset of Clinical Signs: 9/15/2025; Clinical Signs: acute ataxia, hypermetric, hyperesthestic; Confirmation Date: 9/17/2025; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated See past published Outbreak Alerts: https://nwhorsesource.com/category/news/alerts

Confirmed Case(s) – No Quarantine Source: California Department of Food and Agriculture Number Confirmed: 1 Horse 1: Age: 8; Gender: Gelding; Breed: Arabian; Onset of Clinical Signs: 9/8/2025; Clinical Signs: muscle fasciculations (whole body), hypersensitive to touch; Confirmation Date: 9/16/2025; Horse Status: Affected And Alive; Vaccination Status: Vaccinated; Comments: The second (2nd) case of West Nile Virus in California in 2025 was confirmed in Contra Costa County. On … Read More

Confirmed Case(s) – No Quarantine Source: Utah Department of Agriculture and Food Number Confirmed: 1; Number Exposed: 8; Facility Type: Private Facility;  Horse 1: Age: 2; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/15/2025; Clinical Signs: Hind end ataxia, rest WNL; Horse Status: Recovering; Vaccination Status: Unvaccinated; See past published Outbreak Alerts: https://nwhorsesource.com/category/news/alerts

Confirmed Case(s) – No Quarantine Source: Utah Department of Agriculture and Food Number Confirmed: 1; Number Exposed: 5; Number Euthanized: 1; Facility Type: Private Facility;  Horse 1: Age: 2; Gender: Mare; Breed: Quarter Horse (QH); Usage: Barrel Racing; Onset of Clinical Signs: 9/10/2025; Clinical Signs: found down, not prior signs noted; Horse Status: Euthanized; Vaccination Status: Unvaccinated; See past published Outbreak Alerts: https://nwhorsesource.com/category/news/alerts