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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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Pigeon Fever
Albany County, WY
Outbreak Identifier: 7576
Alert ID: 5155
August 20, 2026
Ongoing Investigation

State Veterinarian

Number Confirmed: 2; 
Number Exposed: 8; 
Facility Type: Private Facility; 
Previous Alerts: 5148
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West Nile Virus
Fremont County, WY
Outbreak Identifier: 7582
Alert ID: 5154
August 20, 2026
Confirmed Case(s) - No Quarantine

Attending Veterinarian

Number Confirmed: 1; 
Number Euthanized: 1;
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Strangles
St Clair County, MI
Outbreak Identifier: 7581
Alert ID: 5153
August 20, 2026
Confirmed Case(s) - Voluntary Quarantine

Michigan Department of Agriculture

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

Horse 1: 
Age: 22; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/16/2026; Clinical Signs: coughing, depression, increased respiration rate; Confirmation Date: 8/18/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;
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West Nile Virus
Sioux County, ND
Outbreak Identifier: 7580
Alert ID: 5152
August 20, 2026
Confirmed Case(s) - No Quarantine

State Veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Farm;
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West Nile Virus
East Baton Rouge, LA
Outbreak Identifier: 7579
Alert ID: 5151
August 20, 2026
Confirmed Case(s) - No Quarantine

University Veterinary Hospital

Number Confirmed: 1; 
Number Exposed: Unknown; 
Facility Type: University Veterinary Hospital; 

Horse 1: 
Age: 1; Gender: Colt; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/12/2026; Clinical Signs: Ataxia, spasticity, somnolent, fasciculations; Confirmation Date: 8/14/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;
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Strangles
Willow Creek MD, AB
Outbreak Identifier: 7578
Alert ID: 5150
August 20, 2026
Confirmed Case(s) - Voluntary Quarantine

Attending Veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: Submandibular lymph node abscesses and purulent discharge, recovering well;
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Pigeon Fever
Albany County, WY
Outbreak Identifier: 7577
Alert ID: 5149
August 19, 2026
Ongoing Investigation

State Veterinarian

Number Suspected: 2; 
Number Exposed: 15; 
Facility Type: Boarding Facility;
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Pigeon Fever
Albany County, WY
Outbreak Identifier: 7576
Alert ID: 5148
August 19, 2026
Confirmed Case(s) - No Quarantine

State Veterinarian

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 10; 
Facility Type: Private Facility;
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West Nile Virus
Porter County, IN
Outbreak Identifier: 7575
Alert ID: 5147
August 19, 2026
Confirmed Case(s) - No Quarantine

Indiana State Board of Animal Health

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Age: 19; Gender: Mare; Breed: Miniature Horse; Onset of Clinical Signs: 8/8/2026; Clinical Signs: Ataxia, difficulty getting up and down, dull/confused mentation, poorly toned facial expression, muscle fasciculations along lumbar spine.; Horse Status: Recovering; Vaccination Status: Unvaccinated;
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Vesicular Stomatitis
La Plata and Montrose County, CO
Outbreak Identifier: 7574
Alert ID: 5146
August 19, 2026
Confirmed Case(s) - Official Quarantine

Animal and Plant Health Inspection Service, Veterinary Services

Comments: Since the last VSV situation report (8/13/2026), three presumptive positive equine premises in La Plata County and Montezuma County, Colorado, have been quarantined. All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. 

Updates are as follows: • La Plata County – 1 new presumptive positive equine premises • Montezuma County – 2 new presumptive positive equine premises. Since the last situation report (8/13/2026), 1 previously VSV-affected equine premises has been released from quarantine in La Plata County. 

Since the start of the outbreak, 45 VSV-affected premises have been identified (31 confirmed positive, 14 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. Forty-three (43) premises have had only equine species clinically affected Of the 45 affected premises, 15 were located in 6 Arizona counties (Cochise, Gila, Maricopa, Pinal, Santa Cruz, and Yavapai Counties), 14 premises were located in 5 Colorado counties (Archuleta, Delta, La Plata, Montezuma, and Montrose Counties), and 16 premises were located in 4 New Mexico counties (Rio Arriba, Sandoval, Santa Fe, and Valencia Counties).;

For more information, go to https://www.aphis.usda.gov/livestock-poultry-disease/cattle/vesicular-stomatitis
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