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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
Marion County, OR
Outbreak Identifier: 7437
Alert ID: 5002
May 13, 2026
Confirmed Case(s) - No Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Facility Type: Veterinary Hospital;
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Strangles
Grey County, ON
Outbreak Identifier: 7436
Alert ID: 5001
May 12, 2026
Confirmed Case(s) - Voluntary Quarantine

OMAFA

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

Horse 1: 
Age: 1; Gender: Filly; Breed: Gypsy Vanner; Clinical Signs: This filly developed Strangles ( multiple draining abscesses, persistent fever, weight loss) and died after another horse on the property returned from a 90-day training session at a large training facility which recently had Strangles (see Alert ID 4920). 5 of the 6 horses on this private farm developed Strangles. One senior pony is receiving supportive treatment by the attending veterinarian.; Confirmation Date: 5/8/2026; Horse Status: Deceased; 

Comments: Two outbreaks in 2025 (Alert ID 4302 and 4304) are also epidemiologically linked to the facility in Alert ID 4920. 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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Strangles
Sweet Grass County, MT
Outbreak Identifier: 7435
Alert ID: 5000
May 12, 2026
Exposed Horses - Official Quarantine

State Veterinarian

Number Confirmed: 3; 
Number Suspected: Unknown; 
Number Exposed: 70;
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Strangles
Strafford County, NH
Outbreak Identifier: 7432
Alert ID: 4997
May 08, 2026
Confirmed Case(s) - Official Quarantine

State Veterinarian Office

Number Confirmed: 1; 
Facility Type: Farm; 

Horse 1: 
Confirmation Date: 5/2/2026; 

Comments: The horse is the lone animal on the farm and it is quarantined.;
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Strangles
Belknap County, NH
Outbreak Identifier: 7431
Alert ID: 4996
May 08, 2026
Confirmed Case(s) - Official Quarantine

State Veterinarian Office

Number Confirmed: 1; 
Facility Type: Boarding Facility; 
Comments: The boarding facility will be quarantined until no known new cases.;
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Strangles
Alachua County, FL
Outbreak Identifier: 7430
Alert ID: 4995
May 08, 2026
Confirmed Case(s) - Official Quarantine

Florida Department of Agriculture and Consumer Services

Number Confirmed: 1; 
Number Exposed: 26; 
Facility Type: Stable; 
Comments: This is the 9th confirmed premises with strangles for Florida in 2026.;
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Strangles
Oceana County, MI
Outbreak Identifier: 7426
Alert ID: 4990
May 07, 2026
Confirmed Case(s) - Voluntary Quarantine

Michigan Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 3; 

Horse 1: 
Age: 5; Gender: Stallion; Breed: Quarter Horse (QH); Onset of Clinical Signs: 4/23/2026; Clinical Signs: swollen, draining lymph nodes; Confirmation Date: 5/6/2026; Horse Status: Recovering; Vaccination Status: Status Unknown;
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Strangles
Stettler County, AB
Outbreak Identifier: 7380
Alert ID: 4988
May 06, 2026
Quarantine Released

Attending Veterinarian

Previous Alerts: 4933
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Strangles
Genesee County, MI
Outbreak Identifier: 7205
Alert ID: 4987
May 06, 2026
Outbreak Update

Michigan Department of Agriculture

Number Confirmed: 4; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 

Horse 1: 
Age: 15; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 1/10/2026; Clinical Signs: nasal discharge, enlarged lymph nodes; Confirmation Date: 5/4/2026; Horse Status: Recovered; Vaccination Status: Unvaccinated;

Comments: This premises has previously had three confirmed, reported Strangles cases. This is the fourth confirmed case.; 
Previous Alerts: 4929, 4847, 4731
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Strangles
Washington County, OR
Outbreak Identifier: 7424
Alert ID: 4986
May 06, 2026
Confirmed Case(s) - Voluntary Quarantine

State Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 45; 
Facility Type: Veterinary Hospital;
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