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Outbreak Alerts: November 20, 2025 – Equine Herpesvirus- Respiratory – Larimer County, CO

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

Horse 1: 
Age: 13; Gender: Mare; Breed: Quarter Horse (QH); Usage: Barrel Racing; Onset of Clinical Signs: 11/18/2025; Clinical Signs: Febrile; Confirmation Date: 11/20/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: EHV-1 positive but no neurological signs. This horse was exposed to EHV at the event in Waco, TX. The horse spiked a mild fever after returning home from the event. She is being closely monitored.;

For an up-to-date count of EHM cases tied to this outbreak, please visit HERE

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

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