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Equine Disease Communication Center

Outbreak Alerts: November 25, 2025 – Equine Herpesvirus- Respiratory – Montgomery County, TX

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Equine Rhinitis Virus-B

Source: Attending Veterinarian Exposed Horses – Official Quarantine Number Confirmed: 1; Number Exposed: 30; Facility Type: Private Facility;  Horse 1: Age: 6; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Barrel Racing; Onset of Clinical Signs: 11/18/2025; Clinical Signs: Not Clinical. Primary exposed at WPRA in Waco. Tested positive on nasal swab and blood on In-House Fluxergy PCR; Confirmation Date: 11/18/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown; This case is associated …

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

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Equine Rhinitis Virus-B

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 – new affected county). All confirmed cases in the 2025 outbreak …

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

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Equine Rhinitis Virus-B

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 at the Women’s Professional Rodeo Association (WPRA) World Finals and …

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

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Equine Rhinitis Virus-B

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 the Waco, Texas event, please visit HERE See past published Outbreak …

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

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Equine Rhinitis Virus-B

Source: State Veterinarian 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 …

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Outbreak Alerts: November 18, 2025 – West Nile Virus – Kiowa & Carter and Love Counties, OK

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Equine Rhinitis Virus-B

Kiowa County, OK Source: State Veterinarian Confirmed Case(s) – No Quarantine Number Confirmed: 1; Number Suspected: Unknown; Number Exposed: Unknown; Facility Type: Private Facility;  Horse 1: Age: 5; Gender: Mare; Breed: Appaloosa; Usage: Breeding; Onset of Clinical Signs: 10/20/2025; Clinical Signs: Ataxia, loss of balance, falling forward; Confirmation Date: 11/4/2025; Horse Status: Unknown; Vaccination Status: Unvaccinated;   Carter and Love County, OK Number Confirmed: 1; Number Suspected: Unknown; Number Exposed: Unknown;  Horse 1: Age: 3; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Ranch work; Onset of Clinical Signs: 10/16/2025; Clinical Signs: Anxiety, …

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Outbreak Alerts: November 03, 2025 – Vesicular Stomatitis – Cochise County, AZ

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Equine Rhinitis Virus-B

Source: Arizona Department of Agriculture and United States Department of Agriculture Animal and Plant Health Inspection Service Confirmed Case(s) – Official Quarantine Number Confirmed: 2Number Exposed: 60Facility Type: Private FacilityComments: On October 31, 2025, the National Veterinary Services Laboratories in Ames, Iowa, confirmed findings of vesicular stomatitis New Jersey virus (VSNJV) in horses on …

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Outbreak Alerts: November 01, 2025 – West Nile Virus – Brazos County, TX

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Equine Rhinitis Virus-B

Source: Attending Veterinarian Confirmed Case(s) – No Quarantine Number Confirmed: 2Number Suspected: UnknownNumber Exposed: UnknownFacility Type: Veterinary HospitalComments: Two independent cases; not located on the same farm. For more information about West Nile Virus go to: WNV factsheet.  See past published Outbreak Alerts: www.coloradohorsesource.com/category/news/alerts Equine Disease Communication CenterUpdates on current disease outbreaks are listed on our …

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

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Equine Rhinitis Virus-B

Source: State Veterinarian’s Office Number Confirmed: 1Number 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 Equine Disease Communication CenterUpdates on current disease outbreaks are listed on …

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Outbreak Alerts: October 16, 2025 – Equine Infectious Anemia – MULTIPLE COUNTIES, Texas

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Equine Rhinitis Virus-B

Source: Texas Animal Health Commission Confirmed Case(s) – Official Quarantine Source: Texas Animal Health Commission Williamson County, TX Number Confirmed: 1; Number Suspected: Unknown; Number Exposed: Unknown; Number Euthanized: 1; Comments: Additional to Alert 4467 case. Quarantined 7/16/25. Quarantines will not be released until TAHC’s requirements are met. TAHC staff work closely with the owners and local veterinarians to monitor potentially …

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