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

Shiawassee County, MI

Outbreak Identifier: 4951

Alert ID: 2296

October 14, 2021

Confirmed Case(s) - No Quarantine

Source: Michigan Department of Agriculture and Rural Development

Number Confirmed: 2;
Number Suspected: 1

Age: 12; Gender: Mare; Breed: Paint/Arabian cross; Onset of Clinical Signs: 9/30/2021;
Clinical Signs: High fever, ataxia, and weakness which progressed to the mare being recumbent Horse Status: Euthanized; Vaccination Status: Undervaccinated;
Notes: Horse was reportedly vaccinated by the owner, but the vaccination was given over five years ago.;

Age: 20; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/30/2021;
Clinical Signs: Found down with an inability to get up and thrashing; Horse Status: Euthanized Vaccination Status: Vaccinated;
Notes: Horse was reportedly vaccinated by the owner, but the vaccination was given over five years ago.

Breed: Miniature Horse; Horse Status: Deceased;
Notes: The third horse at the premises, a miniature horse mare of unknown age and vaccination status, was found dead on September 29th. The miniature horse was not tested for EEE.

For more information go to: EEE factsheet

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