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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Eastern Equine Encephalitis

Marathon County, WI

Outbreak Identifier: 7145

Alert ID: 4668

October 17, 2025

Confirmed Case(s) - No Quarantine

Source: Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: Weanling; Gender: Colt; Breed: Paint; Onset of Clinical Signs: 10/6/2025; Clinical Signs: Dull mentation, blindness, ataxia, hind end weakness, increased recumbency; Confirmation Date: 10/15/2025; Horse Status: Recovering;

Comments: Colt is out of a vaccinated dam and may be a case of waning maternal immunity. Colt would not yet have been due for vaccination.;

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