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: 5937

Alert ID: 3378

September 30, 2023

Confirmed Case(s) - No Quarantine

Source: California Department of Food & Agriculture

Number Confirmed: 1
Number Exposed: Unknown
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/20/2023
Clinical Signs: Facial twitching, hyperreactive to stimuli, ataxia; Confirmation Date: 9/25/2023; Horse Status: Recovering; Vaccination Status: Unvaccinated
Comments: This is the 27th case of equine WNV confirmed in CA in 2023. For more information, go to: https://www.cdfa.ca.gov/ahfss/Animal_Health/WNV_Info.html

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