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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.

Vesicular Stomatitis
Outbreak Identifier: 7632
Alert ID: 5207
September 04, 2026
Outbreak Update

USDA-APHIS-Veterinary Services

Comments: A new USDA Vesicular Stomatitis situation report, including quarantine release information, is available here https://www.aphis.usda.gov/sites/default/files/vsv-sitrep-9-3-26.pdf
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West Nile Virus
Morgan County, CO
Outbreak Identifier: 7631
Alert ID: 5206
September 04, 2026
Confirmed Case(s) - No Quarantine

State Veterinarian's Office

Number Confirmed: 1; 
Number Exposed: 20; 
Facility Type: Private Facility; 

Horse 1: 
Age: 1; Gender: Mare; Breed: Quarter Horse (QH); Usage: Farm/Ranch; Onset of Clinical Signs: 8/30/2026; Clinical Signs: Weakness Ataxia Anorexia Teeth Grinding Fever; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
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West Nile Virus
Brown County, WI
Outbreak Identifier: 7630
Alert ID: 5205
September 04, 2026
Confirmed Case(s) - No Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1: 
Age: 6; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/25/2026; Clinical Signs: hyperesthesia, muscle fasciculations; Confirmation Date: 9/3/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
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Strangles
King County, WA
Outbreak Identifier: 7629
Alert ID: 5204
September 04, 2026
Confirmed Case(s) - Voluntary Quarantine

Asst State Veterinarian-WSDA

Number Confirmed: 20; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: large outbreak under vet care. Guttoral pouch lavage samples. Disease has been going on since June.;
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West Nile Virus
Hill County, MT
Outbreak Identifier: 7628
Alert ID: 5203
September 04, 2026
Information Only

Montana State Veterinarian

Number Confirmed: 1; 
Comments: Sample Type: Blood; Testing Method: ELISA;
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West Nile Virus
Yellowstone County, MT
Outbreak Identifier: 7627
Alert ID: 5202
September 04, 2026
Information Only

Montana State Veterinarian

Number Confirmed: 1; 
Comments: Sample Type: Blood; Testing Method: ELISA;
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West Nile Virus
Beaverhead County, MT
Outbreak Identifier: 7626
Alert ID: 5201
September 04, 2026
Information Only

Montana State Veterinarian

Number Confirmed: 1; 
Comments: Sample Type: Blood; Testing Method: ELISA;
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West Nile Virus
Mountrail County, ND
Outbreak Identifier: 7625
Alert ID: 5200
September 03, 2026
Confirmed Case(s) - No Quarantine

State Veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Farm;
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Strangles
Marathon County, WI
Outbreak Identifier: 7624
Alert ID: 5199
September 03, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Suspected: 3; 
Number Exposed: 2; 

Horse 1: 
Age: 16; Gender: Mare; Breed: Warmblood (WB); Confirmation Date: 8/7/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
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Equine Rhinitis Viruses
Josephine County, OR
Outbreak Identifier: 7623
Alert ID: 5198
September 02, 2026
Confirmed Case(s) - Voluntary Quarantine

Attending veterinarian

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