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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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Strangles
Essex County, ON
Outbreak Identifier: 7334
Alert ID: 4881
February 13, 2026
Confirmed Case(s) - Voluntary Quarantine

OMAFA

Number Confirmed: 1; 
Number Exposed: Unknown; 
Facility Type: Boarding Facility; 

Horse 1: 
Gender: Gelding; Onset of Clinical Signs: 2/9/2026; Clinical Signs: Fever, intermittent cough and nasal discharge.; Confirmation Date: 2/12/2026; Vaccination Status: Vaccinated;

Comments: The facility owner, working with their veterinarian, has instituted voluntary animal movement restrictions and biosecurity protocols. To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal;;
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Equine Herpesvirus- Respiratory
Twin Falls County, ID
Outbreak Identifier: 7333
Alert ID: 4880
February 13, 2026
Confirmed Case(s) - No Quarantine

Attending veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: 10; 
Facility Type: Private Facility; 

Horse 1: 
Age: 5; Gender: Gelding; Breed: Quarter Horse (QH); Usage: training; Onset of Clinical Signs: 2/6/2026; Clinical Signs: fever, lethargic, nasal discharge; Confirmation Date: 2/12/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Comments: PCR positive for EHV-4 
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Strangles
Pasco County, FL
Outbreak Identifier: 7332
Alert ID: 4879
February 12, 2026
Confirmed Case(s) - Official Quarantine

FDACS Veterinary Medical Officer

Number Confirmed: 1; 
Number Exposed: 10;
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Equine Herpesvirus- Respiratory
Manitowoc County, WI
Outbreak Identifier: 7330
Alert ID: 4878
February 10, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 4; 
Facility Type: Private Facility; 

Horse 1: 
Age: Yearling; Gender: Filly; Breed: Draft; Clinical Signs: intermittent low-grade fever, mild intermittent respiratory signs since acquiring ~4 months ago; Confirmation Date: 2/2/2026; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;
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Strangles
Marinette County, WI
Outbreak Identifier: 7329
Alert ID: 4877
February 10, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Exposed: 12; 
Facility Type: Private Facility; 

Horse 1: 
Age: 12; Gender: Mare; Breed: Miniature Horse; Clinical Signs: nasal discharge, mandibular lymphadenopathy/drainage; Confirmation Date: 2/6/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Comments: Acquired from a kill pen ~ 4 weeks ago along with another mini;
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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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Strangles
Regional Municipality of Niagara, ON
Outbreak Identifier: 7327
Alert ID: 4875
February 09, 2026
Confirmed Case(s) - Voluntary Quarantine

OMAFA

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

Horse 1: 
Age: 10; Gender: Gelding; Breed: Quarter Horse (QH); Clinical Signs: This gelding developed an acute fever followed by a unilateral swelling behind the jaw which was painful to the touch. Nasopharyngeal swab was positive for S. equi by PCR. He has been isolated.; Confirmation Date: 2/2/2026; 

Comments: The facility owner, working with their veterinarian, has instituted voluntary animal movement restrictions and biosecurity protocols. To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal;
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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- Respiratory
Cecil County, MD
Outbreak Identifier: 7324
Alert ID: 4873
February 08, 2026
Confirmed Case(s) - Official Quarantine

Maryland Department of Agriculture

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 26; 
Facility Type: Private Facility; 

Horse 1: 
Age: 15; Gender: Gelding; Breed: Thoroughbred (TB); Usage: Pleasure Riding; Onset of Clinical Signs: 1/30/2026; Confirmation Date: 2/6/2026; Horse Status: Quarantined; Vaccination Status: Status Unknown;
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Equine Influenza
Cecil County, MD
Outbreak Identifier: 7323
Alert ID: 4872
February 08, 2026
Confirmed Case(s) - Official Quarantine

Maryland Department of Agriculture

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 26; 
Facility Type: Private Facility; 

Horse 1: 
Age: 15; Gender: Gelding; Breed: Thoroughbred (TB); Usage: Pleasure Riding; Onset of Clinical Signs: 1/30/2026; Clinical Signs: Nasal Discharge Pleuropneumonia Febrile; Confirmation Date: 2/6/2026; Horse Status: Quarantined; Vaccination Status: Status Unknown;
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