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EHV/EHM

Important Equine Health Alert: EHV/EHM Information for Colorado

Dear Colorado horse community, The Colorado State Veterinarian’s Office is monitoring an outbreak of Equine Herpes Virus (EHV) / Equine Herpes Myeloencephalopathy (EHM) associated with barrel racing and rodeo-type events in Texas and Oklahoma between November 5–9. Several cases, including equine deaths, …

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Equine Rhinitis Virus-B

Outbreak Alerts: November 24, 2025 – Vesicular Stomatitis – Gila County, AZ

Source: United States Department of Agriculture Animal and Plant Health Inspection Service Confirmed Case(s) – Official Quarantine Number Confirmed: 1; Comments: Since the last situation report (10/31/2025), there has been one (1) new confirmed positive equine premises identified in Arizona (Gila County – …

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Equine Rhinitis Virus-B

Outbreak Alerts: November 22, 2025 – Equine Herpesvirus- Neurologic in Eddy County, NM

Confirmed Case(s) – Official Quarantine Source: State Veterinarian Number Confirmed: 2; Number Exposed: 3; Comments: One horse traveled to Waco for WPRA; this horse tested PCR positive on both nasal swab and blood and has exhibited fever and neurologic symptoms. The second horse had not …

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Equine Rhinitis Virus-B

Outbreak Alerts: November 22, 2025 – Equine Herpesvirus- Respiratory – Maricopa County, AZ

Source: Arizona Department of Agriculture Exposed Horses – Official Quarantine Number Confirmed: 1; Number Exposed: 3; Facility Type: Private Facility; Comments: Horse is nasal swab PCR positive for EHV-1 D752 but clinically normal, not febrile, no neurologic signs. This case is associated with the EHM outbreak that originated …

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Equine Rhinitis Virus-B

Outbreak Alerts: November 21, 2025 – Equine Herpesvirus- Neurologic in McLennan County, TX

Confirmed Case(s) – Official Quarantine Source: Attending Veterinarian Number Suspected: Unknown; Number Exposed: Unknown; Facility Type: Veterinary Hospital; Comments: Hospitalized horse with consistent EHM signs with known exposure to Waco facility; For an up-to-date count of EHM cases tied to this outbreak, please visit HERE For more information …

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Equine Rhinitis Virus-B

Outbreak Alerts: November 21, 2025 – Equine Herpesvirus- Neurologic in Hood County, TX

Confirmed Case(s) – Official Quarantine Source: Private Practitioner Number Confirmed: 1; Number Suspected: Unknown; Number Exposed: Unknown; Facility Type: Private Facility; Comments: This case is associated with the EHM outbreak that originated at the Women’s Professional Rodeo Association (WPRA) World Finals and Elite Barrel Race event; For an up-to-date count …

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Equine Rhinitis Virus-B

Outbreak Alerts: November 21, 2025 – Equine Herpesvirus- Neurologic in Erath County, TX

Confirmed Case(s) – Official Quarantine Source: Private Practitioner Number Confirmed: 1; Number Suspected: 1; Number Exposed: Unknown; Facility Type: Private Facility; Comments: This case is associated with the EHM outbreak that originated at the Women’s Professional Rodeo Association (WPRA) World Finals and Elite Barrel Race event; For an up-to-date count …

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Equine Rhinitis Virus-B

Outbreak Alert: November 21, 2025 – Equine Influenza in Lancaster County, NE

Confirmed Case(s) –  No Quarantine Source: Attending Veterinarian Number Confirmed: 1; Number Suspected: Unknown; Number Exposed: Unknown; Facility Type: Boarding Facility;  Horse 1: Age: 16; Gender: Gelding; Breed: Morgan; Usage: Trail Riding; Onset of Clinical Signs: 11/7/2025; Clinical Signs: Snotty nose, cough; Confirmation Date: 11/13/2025; Horse Status: Recovering; Vaccination Status: Status Unknown; For more information about Equine Influenza, go to https://www.equinediseasecc.org/equine-influenza See past published Outbreak Alerts: www.coloradohorsesource.com/category/news/alerts
Equine Rhinitis Virus-B

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

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 …

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Equine Rhinitis Virus-B

Outbreak Alerts: November 20, 2025 – Equine Herpesvirus- Neurologic in Fort Bend County, TX

Confirmed Case(s) – Official Quarantine Source: Attending Veterinarian and TAHC Number Confirmed: 1; Number Exposed: 2; Facility Type: Private Facility;  Horse 1: Age: 23; Breed: Quarter Horse (QH); Usage: Barrel Racing; Onset of Clinical Signs: 11/19/2025; Clinical Signs: Ataxia, urine dribbling; Confirmation Date: 11/20/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown; Comments: This case is associated with the EHM outbreak …

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Equine Rhinitis Virus-B

Outbreak Alerts: November 20, 2025 – Equine Herpesvirus- Neurologic in Bell County Texas, TX

Confirmed Case(s) – Official Quarantine Source: Attending Veterinarian Number Confirmed: 1; Number Suspected: 1; Number Exposed: Unknown; Number Euthanized: 1; Facility Type: Veterinary Hospital; Comments: Horse presented on 11/17/25; recumbent within an hour of admission. Euthanized after 48 hours of recumbency.; This horse was exposed to EHV at the Women’s Professional Rodeo …

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Equine Rhinitis Virus-B

Outbreak Alerts: November 20, 2025 – Equine Herpesvirus- Respiratory – Oklahoma County, OK

Source: Oklahoma State Veterinarian Number Confirmed: 1; Number Suspected: Unknown; Number Exposed: Unknown; Comments: This horse was exposed to EHV at the Women’s Professional Rodeo Association (WPRA) World Finals and Elite Barrel Race event in Waco, TX.. For an up-to-date count of EHM cases tied to …

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