South Carolina Pony Confirmed With WNV

The pony’s vaccination and health status are unknown.
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Berkeley County, SC
The pony’s vaccination and health status are unknown. | Photo: Wikimedia Commons
Officials at Clemson Livestock Poultry Health (CLPH) have confirmed a 4-year-old pony stallion in Berkeley County, South Carolina, with West Nile virus (WNV). The pony’s vaccination and health status are unknown.

About West Nile Virus

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

Health Alert: West Nile Virus in Horses
VIDEO | Health Alert: West Nile Virus in Horses

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.

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