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

Merced County, CA

Outbreak Identifier: 5779

Alert ID: 3215

August 23, 2023

Confirmed Case(s) - No Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: Unknown;
Age: 2; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/10/2023;
Clinical Signs: Grade 3-4 ataxia, somnolence, muscle fasciculations, low grade fever. Neurological signs improved but patient was subsequently euthanized due to comorbidities.; Confirmation Date: 8/18/2023; Horse Status: Euthanized; Vaccination Status: Vaccinated;
Comments: This is the 11th case of equine WNV confirmed in California for 2023. For more information, go to: https://www.cdfa.ca.gov/ahfss/Animal_Health/WNV_Info.html

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