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West Nile Virus Confirmed in California Horse

October 9, 2020
Posted by Diane E. Rice

This marks the state’s 14th positive equine WNV case for 2020.

Topics: Article, Diseases and Conditions, Horse Care, Horse Industry News, Neurologic Disease, Welfare and Industry, West Nile Virus (WNV)

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West Nile Virus Confirmed in California Horse

WNV transmission occurs when infected mosquitoes feed on animals, as well as humans, after having fed on infected birds. | Photo: Photos.com

On Sept. 30, officials at the California Department of Food and Agriculture (CDFA) confirmed an unvaccinated 2-year-old pony colt in Nevada County as positive with West Nile virus (WNV). The colt, which is reported as affected and alive, experienced onset of neurologic signs that included ataxia (loss of muscle control) and recumbency (down and unable to rise) on Sept. 25.

According to a CDFA statement, the colt marks the state’s 14th confirmed equine case this year. The positive horses were located in the following counties:

Amador (1)
Butte (1)
Glenn (1)
Kings (1)
Merced (1)
Nevada (1)
Riverside (2)
San Bernardino (1)
San Joaquin (2)
Stanislaus (3)

Of those horses affected, eight were unvaccinated, four had unknown vaccination histories, and two were vaccinated. Eleven horses remain alive. One horse died and two were euthanized

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Written by:

Diane E. Rice

Diane Rice earned her bachelor’s degree in agricultural journalism from the University of Wisconsin, then married her education with her lifelong passion for horses by working in editorial positions at Appaloosa Journal for 12 years. She has also served on the American Horse Publications’ board of directors. She now freelances in writing, editing, and proofreading. She lives in Middleton, Idaho, and spends her spare time gardening, reading, serving in her church, and spending time with her daughters, their families, and a myriad of her own and other people’s pets.