WNV in Idaho Horses: Fourth Case of 2018 Confirmed

An unvaccinated 2-year-old Quarter Horse filly showed an onset of clinical signs on Aug. 27, including facial and muscle fasciculations (twitching) and Grade 2/5 ataxia (incoordination) in all four limbs.
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WNV in Idaho horses
West Nile virus is transmitted to horses via bites from infected mosquitoes. | Photo: iStock

The Equine Disease Communication Center (EDCC) reported Aug. 31 that another Idaho horse has tested positive for West Nile virus (WNV). This is the fourth confirmed case of WNV in Idaho horses this year.

“The Idaho State Veterinarian has confirmed a case of West Nile virus in a horse at a private facility in Canyon County,” the EDCC said. “An unvaccinated 2-year-old Quarter Horse filly showed an onset of clinical signs on Aug. 27, including facial and muscle fasciculations (twitching) and Grade 2/5 ataxia (incoordination) in all four limbs. WNV was confirmed at the Idaho State Department of Agriculture Animal Health Laboratory on ELISA.”

In 2017 there were five confirmed cases of WNV in Idaho horses, according to USDA Animal and Plant Health Inspection Service data

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Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.

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