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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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The color range is based off of the selected End Date. If the End Date doesn't have a value it will use Today's Date.

Equine Herpesvirus- Respiratory
Baltimore County, MD
Outbreak Identifier: 7695
Type: EHV-1
Alert ID: 5271
September 24, 2026
Investigation Initiated

Maryland Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 

Horse 1: 
Age: 4; Gender: Mare; Breed: Warmblood (WB); Usage: Horse Show; Onset of Clinical Signs: 9/20/2026; Confirmation Date: 9/22/2026; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;
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West Nile Virus
Cecil County, MD
Outbreak Identifier: 7694
Alert ID: 5270
September 24, 2026
Investigation Initiated

Maryland Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 15; Gender: Mare; Breed: Quarter Horse (QH); Usage: Pleasure Riding; Onset of Clinical Signs: 9/10/2026; Confirmation Date: 9/18/2026; Horse Status: Euthanized; Vaccination Status: Status Unknown;
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Pigeon Fever
Deschutes County, OR
Outbreak Identifier: 7693
Alert ID: 5269
September 24, 2026
Confirmed Case(s) - Official Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Suspected: 4; 
Number Exposed: 23;
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West Nile Virus
Box Elder County, UT
Outbreak Identifier: 7692
Alert ID: 5268
September 23, 2026
Confirmed Case(s) - No Quarantine

Utah Department of Agriculture and Food

Number Confirmed: 1; 
Number Exposed: Unknown;
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Strangles
Richland County, WI
Outbreak Identifier: 7691
Alert ID: 5267
September 23, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Exposed: 3; 

Horse 1: 
Age: Yearling; Gender: Colt; Breed: Standardbred; Clinical Signs: Nasal discharge; Confirmation Date: 9/17/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
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Potomac Horse Fever
Washington County, TN
Outbreak Identifier: 7690
Alert ID: 5266
September 23, 2026
Confirmed Case(s) - No Quarantine

Tennessee Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown;
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West Nile Virus
Adams County, IN
Outbreak Identifier: 7689
Alert ID: 5265
September 23, 2026
Confirmed Case(s) - No Quarantine

Indiana State Board of Animal Health

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: Unknown; 
Number Euthanized: 1; 

Horse 1: 
Age: 5; Gender: Mare; Breed: Standardbred; Usage: Carriage; Onset of Clinical Signs: 9/13/2026; Clinical Signs: Owners noticed gait was off while driving on 9/13. She was examined on 9/14, and she could barely stand. When they got her up, she was staggering with the left front limb most affected. On 9/15, she was recumbent and euthanized.; Confirmation Date: 9/18/2026; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
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Pigeon Fever
Deschutes County, OR
Outbreak Identifier: 7688
Alert ID: 5264
September 23, 2026
Suspected Case - Official Quarantine

State Department of Agriculture

Number Suspected: 2; 
Number Exposed: 1; 
Comments: Confirmatory sample submitted for PCR; awaiting results;
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Pigeon Fever
Deschutes County, OR
Outbreak Identifier: 7687
Alert ID: 5263
September 23, 2026
Suspected Case - Official Quarantine

State Department of Agriculture

Number Suspected: 1; 
Number Exposed: 30;
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Strangles
Dane County, WI
Outbreak Identifier: 7686
Alert ID: 5262
September 23, 2026
Confirmed Case(s) - Voluntary Quarantine

Attending Veterinarian

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: Unknown;
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