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Outbreak Alerts: October 29, 2025 – West Nile Virus – Weld County, CO

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Number Confirmed: 1
Number Exposed: Unknown 
Facility Type: Private Facility

Horse 1: 
Age: 3; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 10/21/2025; Clinical Signs: Ataxia Fasciculation; Confirmation Date: 10/29/2025; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

For more information about West Nile Virus go to: WNV factsheet. 

See past published Outbreak Alerts: www.coloradohorsesource.com/category/news/alerts

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