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Disease Alerts

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.



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Equine Herpesvirus- Neurologic
Silver Bow County, MT
Outbreak Identifier: 7328
Alert ID: 4876
February 09, 2026
Investigation Initiated

Montana Department of Livestock

Number Confirmed: 1; 
Number Exposed: 50;
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Equine Herpesvirus- Neurologic
Cecil County, MD
Outbreak Identifier: 7325
Alert ID: 4874
February 08, 2026
Quarantine Released

Maryland Department of Agriculture

Number Confirmed: 1; 
Number Suspected: 27; 
Number Exposed: 27; 
Facility Type: Training Facility;
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Equine Herpesvirus- Neurologic
Waukesha County, WI
Outbreak Identifier: 7308
Alert ID: 4867
February 05, 2026
Confirmed Case(s) - Official Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Suspected: 3; 
Number Exposed: 38; 
Number Euthanized: 1; 
Facility Type: Private Facility; 
Comments: Updating to add actual # of horses on quarantined premises (41); 
Previous Alerts: 4852
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Equine Herpesvirus- Neurologic
Saline County, IL
Outbreak Identifier: 7319
Alert ID: 4866
February 04, 2026
Confirmed Case(s) - Voluntary Quarantine

Attending Veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: 15; 
Facility Type: Private Facility; 
Comments: In house PCR using the Fluxergy system. Patient has improved over 24 hours with supportive care. Horse is no longer at hospital and no horses were directly exposed during its stay at the hospita.;
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Equine Herpesvirus- Neurologic
Geauga County, OH
Outbreak Identifier: 7294
Type: EHV-1
Alert ID: 4855
January 30, 2026
Quarantine Released

State Dept. of Agriculture

Number Confirmed: 1; 
Number Exposed: 8; 
Number Euthanized: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 13; Gender: Mare; Breed: Pony; Usage: Pleasure Riding; Confirmation Date: 1/8/2026; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: The two Geauga county cases are unrelated and not epidemiologically linked. The quarantine was released January 29, 2026.; 
Previous Alerts: 4835
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Equine Herpesvirus- Neurologic
Geauga County, OH
Outbreak Identifier: 7293
Type: EHV-1
Alert ID: 4854
January 30, 2026
Quarantine Released

State Dept. Agriculture

Number Confirmed: 1; 
Number Exposed: 28; 
Number Euthanized: 1; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 15; Gender: Mare; Breed: Standardbred; Usage: Breeding; Confirmation Date: 1/9/2026; Horse Status: Euthanized; Vaccination Status: Status Unknown;

Comments: The two Geauga County cases are unrelated and not epidemiologically linked. The quarantine was released Jan. 29, 2026.; 
Previous Alerts: 4834
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Equine Herpesvirus- Neurologic
Pinal County, AZ
Outbreak Identifier: 7309
Alert ID: 4853
January 30, 2026
Confirmed Case(s) - Official Quarantine

Arizona Department of Agriculture

Number Confirmed: 2; 
Number Exposed: Unknown; 
Facility Type: Private Facility;
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Equine Herpesvirus- Neurologic
Waukesha County, WI
Outbreak Identifier: 7308
Alert ID: 4852
January 29, 2026
Confirmed Case(s) - Official Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Exposed: 45; 
Number Euthanized: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 23; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 1/26/2026; Clinical Signs: Acute onset neurologic signs; Confirmation Date: 1/28/2026; Horse Status: Euthanized; Vaccination Status: Vaccinated;

Comments: Affected equine had no recent travel history;
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Equine Herpesvirus- Neurologic
Geauga County, OH
Outbreak Identifier: 7294
Alert ID: 4835
January 12, 2026
Confirmed Case(s) - Official Quarantine

State Dept of Agriculture

Number Confirmed: 1; 
Number Exposed: 8; 
Number Euthanized: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 13; Gender: Mare; Breed: Pony; Usage: Pleasure Riding; Clinical Signs: Neurological signs; Confirmation Date: 1/8/2026; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: The two Geauga county cases are unrelated and not epidemiologically linked.;
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Equine Herpesvirus- Neurologic
Geauga County, OH
Outbreak Identifier: 7293
Alert ID: 4834
January 12, 2026
Confirmed Case(s) - Official Quarantine

State Dept of Agriculture

Number Confirmed: 1; 
Number Exposed: 28; 
Number Euthanized: 1; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 15; Gender: Mare; Breed: Standardbred; Usage: Breeding; Clinical Signs: Acutely down, neurologic; Confirmation Date: 1/9/2026; Horse Status: Euthanized; Vaccination Status: Status Unknown;

Comments: The two Geauga county cases are unrelated and not epidemiologically linked.;
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