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Outbreak

Outbreak Alerts: January 12, 2026 – Equine Infectious Anemia – Adams County, CO

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Equine Rhinitis Virus-B

Source: State Veterinarian’s Office Confirmed Case(s) – Official Quarantine Number Confirmed: 3; Number Exposed: 11; Number Euthanized: 3;  Horse 1: Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Usage: Racing; Onset of Clinical Signs: 12/16/2025; Clinical Signs: tested dur to exposure of another positive horse on the premises.; Confirmation Date: 12/23/2025; Horse Status: Euthanized;  Horse 2: Age: 4; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Racing; Horse Status: Euthanized;  Horse 3: Age: 4; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Racing; Onset of Clinical Signs: 12/16/2025; Clinical Signs: tested due to exposure to …

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Outbreak Alerts: December 31, 2025 – Equine Infectious Anemia – Adams County, CO

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Equine Rhinitis Virus-B

Source: State Veterinarian’s Office Confirmed Case(s) – Official Quarantine Number Confirmed: 1; Number Exposed: 13; Number Euthanized: 1; Facility Type: Training Facility;  Horse 1: Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Usage: Racing; Clinical Signs: Unthrifty, poor body condition, tested for interstate movement requirements; Confirmation Date: 12/23/2025; Horse Status: Euthanized;  Comments: Confirmatory testing for cohorts is pending.; For more information:  https://www.equinediseasecc.org/equine-infectious-anemia See past published Outbreak Alerts: www.coloradohorsesource.com/category/news/alerts Equine Disease Communication …

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Outbreak Alerts: December 30, 2025 – Vesicular Stomatitis – Santa Cruz 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 Comments: Since the last situation report (12/9/2025), there has been one (1) new confirmed VSVpositive equine premises identified in Arizona (Santa Cruz County). All confirmed cases in the 2025 outbreak have been vesicular stomatitis …

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Outbreak Alerts: December 24, 2025 – Equine Herpesvirus- Neurologic in Eddy & Dona Ana Counties, NM

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Equine Rhinitis Virus-B

Confirmed Case(s) – Quarantine Released Source: State Veterinarian Eddy County: Number Confirmed: 2; Number Exposed: 3; Comments: All of our hold orders were released around 12/7 to 12/10. Our last quarantine was released on 12/21. As of right now, we have no active cases.; Previous Alerts: 4743 Dona Ana County: Number Confirmed: 1; Number Exposed: 2; Comments: All of our hold orders …

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Outbreak Alerts: December 23, 2025 – Equine Herpesvirus- Neurologic in Larimer County, CO

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Equine Rhinitis Virus-B

Confirmed Case(s) – Quarantine Released Source: State Veterinarian’s Office Number Confirmed: 1; Number Exposed: Unknown; Comments: Notice of quarantine release; Previous Alerts: 4730, 4723 For more information go to: https://www.equinediseasecc.org/equine-herpesvirus See past published Outbreak Alerts: www.coloradohorsesource.com/category/news/alerts Equine Disease Communication CenterUpdates on current disease outbreaks are listed on our EDCC website as they occur and will include the date listed, disease …

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Outbreak Alerts: December 19, 2025 – Equine Herpesvirus- Neurologic in Bowie County, TX

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Equine Rhinitis Virus-B

Confirmed Case(s) – Official Quarantine Source: Private Practitioner and State Animal Health Official Number Confirmed: 1; Number Suspected: Unknown; Number Exposed: Unknown;  Horse 1: Breed: Donkey; Clinical Signs: The donkey was recently acquired from Bowie Livestock Sale. The donkey subsequently developed neurologic signs and was transferred to a referral hospital for care on 12/17/25.; This case is not associated …

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Outbreak Alerts: December 11, 2025 – Vesicular Stomatitis – Maricopa 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 Comments: Since the last situation report (11/26/2025), there has been one (1) new confirmed positive equine premises identified in Arizona (Maricopa County – new affected county). All confirmed cases in the 2025 outbreak have …

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Outbreak Alerts: November 30, 2025 – Equine Herpesvirus- Neurologic in Pinal County, AZ

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Equine Rhinitis Virus-B

Confirmed Case(s) – Official Quarantine Source: Arizona Department of Agriculture Number Confirmed: 1Number Exposed: 8Number Euthanized: 1Facility Type: Private FacilityComments: No known direct exposure or epidemiologic link to any of the previously reported quarantined premises in Arizona nor any of the known exposure events in Texas or Oklahoma. For more information go to: https://www.equinediseasecc.org/equine-herpesvirus See past …

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Outbreak Alerts: Nov 25 – Dec 04, 2025 – Equine Herpesvirus – Neurologic & Respiratory – MULTIPLE COUNTIES, TEXAS

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Equine Rhinitis Virus-B

Information Only Source: Texas Animal Health Commission Comments: To date 30 cases have been confirmed by the Texas Animal Health Commission with the last case confirmed Nov. 27, 2025. Five of the submitted cases died or were euthanized. Cases have been identified in the following counties: Montgomery, Lee, McLennan, Ellis, Wise, …

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Outbreak Alerts: November 26, 2025 – Vesicular Stomatitis – Santa Cruz 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 Comments: Since the last situation report (11/24/2025), there has been one (1) new confirmed positive equine premises identified in Arizona (Santa Cruz County – new affected county). All confirmed cases in the 2025 …

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