Outbreak Alert: August 11, 2021 – West Nile Virus in Twin Falls County, ID

Idaho State Department of Agriculture

Number Confirmed: 1;

Facility Type: Private Facility;

Age: 3; Gender: Gelding; Breed: Quarter Horse (QH);

Onset of Clinical Signs: 7/24/2021; Clinical Signs: Ataxia, Muscle Fasciculations;

Confirmation Date: 8/6/2021; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Notes: A horse at a private facility in Twin Falls County has tested positive for West Nile Virus. There are four horses total on-site; no history of vaccination of any kind. For more information about West Nile Virus go to the WNV factsheet. 


All information is sourced from

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