Outbreaks | Equine Disease Communication Center

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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Potomac Horse Fever

Green County, WI

Outbreak Identifier: 7522

Alert ID: 5093

July 29, 2026

Confirmed Case(s) - No Quarantine

Source: Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 2;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 14; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 7/22/2026; Clinical Signs: watery diarrhea/fever; Confirmation Date: 7/24/2026; Horse Status: Recovering; Vaccination Status: Vaccinated;

Horse 2:
Age: 20; Gender: Gelding; Breed: Thoroughbred (TB); Onset of Clinical Signs: 7/22/2026; Clinical Signs: lethargy, fever, dehydration, (later) diarrhea; Confirmation Date: 7/24/2026; Horse Status: Recovering; Vaccination Status: Vaccinated;

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