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A Snapshot of Eastern Equine Encephalitis and West Nile Virus Case Counts
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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.



West Nile Virus
Cleveland County, OK
Outbreak Identifier: 6513
Alert ID: 3989
September 26, 2024
Confirmed Case(s) - No Quarantine

State Veterinarian

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

Horse 1: 
Age: 6; Gender: Mare; Breed: Quarter Horse (QH); Usage: Pleasure Riding; Onset of Clinical Signs: 9/1/2024; Clinical Signs: Facial twitches, hyper responsive to visual stimuli, hyperspastic movement; Confirmation Date: 9/11/2024; Horse Status: Recovered; Vaccination Status: Vaccinated;
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West Nile Virus
Choctaw County, OK
Outbreak Identifier: 6512
Alert ID: 3988
September 26, 2024
Confirmed Case(s) - No Quarantine

State Veterinarian

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

Horse 1: 
Age: 2; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/16/2024; Clinical Signs: Ataxia, fever, depression; Confirmation Date: 9/24/2024; Horse Status: Recovered; Vaccination Status: Unvaccinated;
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Strangles
Muskegon County, MI
Outbreak Identifier: 6511
Alert ID: 3987
September 26, 2024
Confirmed Case(s) - Voluntary Quarantine

Michigan Department of Agriculture and Rural Development

Number Confirmed: 1; 
Number Exposed: 1; 

Horse 1: 
Age: 3; Gender: Filly; Breed: Shetland Pony; Onset of Clinical Signs: 9/17/2024; Clinical Signs: Nasal discharge, swollen lymph node, fever; Horse Status: Recovering; Vaccination Status: Status Unknown;
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Eastern Equine Encephalitis
Plymouth County, MA
Outbreak Identifier: 6510
Alert ID: 3986
September 26, 2024
Information Only

State Veterinarian

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

Horse 1: 
Onset of Clinical Signs: 9/18/2024; Horse Status: Euthanized; 

Comments: Vaccination against EEE is highly effective at preventing this disease.;
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Strangles
Tuscola County, MI
Outbreak Identifier: 6509
Alert ID: 3985
September 26, 2024
Confirmed Case(s) - Voluntary Quarantine

Michigan Department of Agriculture and Rural Development

Number Confirmed: 1; 
Number Suspected: 3; 
Number Exposed: 3; 

Horse 1: 
Age: 8; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 7/26/2024; Clinical Signs: nasal discharge, cough, and mandibular abscess; Confirmation Date: 9/24/2024; Horse Status: Recovering; Vaccination Status: Unvaccinated;
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West Nile Virus
Adams and Elkhart Counties County, IN
Outbreak Identifier: 6508
Alert ID: 3984
September 25, 2024
Confirmed Case(s) - No Quarantine

Indiana State Board of Animal Health

Number Confirmed: 2; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 

Horse 1: 
Age: 6; Gender: Mare; Breed: Standardbred Cross; Onset of Clinical Signs: 9/16/2024; Clinical Signs: hind end weakness, tail held askew; Vaccination Status: Unvaccinated;

Horse 2: 
Age: 7; Gender: Gelding; Breed: Standardbred; Onset of Clinical Signs: 9/12/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
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West Nile Virus
Kent County, MI
Outbreak Identifier: 6505
Alert ID: 3983
September 25, 2024
Confirmed Case(s) - No Quarantine

Michigan Department of Agriculture and Rural Development

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

Horse 1: 
Age: 8; Gender: Gelding; Breed: Grade; Onset of Clinical Signs: 9/9/2024; Clinical Signs: Fever, muscle fasciculations, ataxia; Confirmation Date: 9/24/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
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West Nile Virus
Canyon County, ID
Outbreak Identifier: 6504
Alert ID: 3982
September 25, 2024
Confirmed Case(s) - No Quarantine

State Department of Agriculture

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

Horse 1: 
Age: 11; Gender: Mare; Clinical Signs: Dulll mentation, Mild ataxia; Confirmation Date: 9/25/2024; Horse Status: Recovering; Vaccination Status: Undervaccinated;
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West Nile Virus
Adair County, KY
Outbreak Identifier: 6503
Alert ID: 3981
September 25, 2024
Confirmed Case(s) - No Quarantine

Kentucky Department of Agriculture

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

Horse 1: 
Age: 2; Gender: Colt; Breed: Tennessee Walking Horses; Onset of Clinical Signs: 9/20/2024; Clinical Signs: Ataxic, hypersensitive to touch, muscle fasciculation; Confirmation Date: 9/25/2024; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Comments: This is KY's 7th confirmed equine WNv case this calendar year;
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West Nile Virus
Douglas County, CO
Outbreak Identifier: 6502
Alert ID: 3980
September 25, 2024
Confirmed Case(s) - No Quarantine

State Veterinarian

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

Horse 1: 
Age: 8; Gender: Mare; Breed: Tennessee Walking Horses; Usage: Pleasure Riding; Clinical Signs: Weakness, ataxia; Confirmation Date: 9/19/2024; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
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