12/19/2025
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The multi-state Equine Herpes Virus (EHV-1) outbreak is reaching its conclusion. The single EHV-1 positive horse in Colorado has made a full recovery and was released from quarantine on December 11, 2025. Additionally, after a period of close monitoring ensuring no new cases of illness, all hold orders for Colorado horses exposed at the Texas and Oklahoma events were released on December 10, 2025. We encourage owners to remain cautious, especially during out-of-state travel and at commingling events.
For a comprehensive resource of general guidelines and best practices, visit the EHV/EHM webpage at https://ag.colorado.gov/animal-health/reportable-diseases/equine-neurologic-disease/equine-herpes-virus-outbreak