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Outbreak Alerts: November 21, 2025 – Equine Herpesvirus- Neurologic in Larimer County, CO

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Confirmed Case(s) – Official Quarantine

Source: State Veterinarian’s Office

Number Confirmed: 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 and now showing neurological signs; Confirmation Date: 11/20/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: Originally EHV-1 positive with no neurological signs but developed neurological signs overnight. 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
Previous Alerts: 4723

For more information go to: https://www.equinediseasecc.org/equine-herpesvirus

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

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