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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West Nile Virus

Amador and Stanislaus County, CA

Outbreak Identifier: 4907

Alert ID: 2253

September 21, 2021

Confirmed Case(s) - No Quarantine

Source: California Department of Food and Agriculture

Amador County
Number Confirmed: 1;
Age: 3; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/15/2021;
Clinical Signs: Muscle Fasciculations, Severe Ataxia, Hyperreactive to light; Confirmation Date: 9/20/2021; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Stanislaus County
Number Confirmed: 1;
Age: 7; Gender: Mare; Breed: Pony; Onset of Clinical Signs: 9/11/2021;
Clinical Signs: Febrile, Mild Ataxia, Muscle Fasciculations of head and neck, Lower Lip Dropping, Hyperreactive to touch and movement; Confirmation Date: 9/20/2021; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;
Notes: For more information about West Nile Virus go to the WNV factsheet.;

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