California Horse Confirmed With WNV

The mare’s vaccination history is unknown.
Share
Favorite
Close

No account yet? Register

ADVERTISEMENT

San Joaquin County, CA
The 6-year-old Quarter Horse mare in San Joaquin County is reported as affected and alive. | Photo: Wikimedia Commons

On Sept. 7, officials at the California Department of Food and Agriculture (CDFA) confirmed a 6-year-old Quarter Horse mare in San Joaquin County with West Nile virus (WNV). She had presented on Sept. 1 with clinical signs that included teeth grinding, hind limb ataxia, poor appetite, and fasciculations (twitching) in neck and front end.  Her vaccination status is unknown. She is reported as affected and alive.

About West Nile Virus

WNV transmission occurs when infected mosquitoes feed on animals, as well as humans, after having fed on infected birds.

Clinical signs of WNV in horses include:

  • Mild anorexia and depression
  • Fine and coarse muscle and skin fasciculation;
  • Hyperesthesia (hypersensitivity to touch and sound);
  • Changes in mentation (mentality), when horses look like they’re daydreaming or “just not with it”;
  • Occasional drowsiness;
  • Propulsive walking (driving or pushing forward, often without control);
  • Spinal signs, including asymmetrical weakness; and
  • Asymmetrical or symmetrical ataxia.

West Nile virus has no cure; however, some horses can recover with supportive care. Equine mortality rates can reach 30-40%. The American Association of Equine Practitioners includes WNV as one of the core diseases all horses should be vaccinated against at least annually.

Share

Written by:

Related Articles

Stay on top of the most recent Horse Health news with

FREE weekly newsletters from TheHorse.com

Sponsored Content

Weekly Poll

sponsored by:

Do you use slow feeders or slow feed haynets for your horse? Tell us why or why not.
289 votes · 289 answers

Readers’ Most Popular

Sign In

Don’t have an account? Register for a FREE account here.

Need to update your account?

You need to be logged in to fill out this form

Create a free account with TheHorse.com!