South Shore Equine Clinic & Diagnostic Center
Equine Veterinary Services South Shore Boston Massachusetts

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10 Tips for Reducing Your Horse's West Nile & Triple E Risk

Since first being recognized in the United States in 1999, West Nile virus (WNV) has posed a serious threat to horses and humans alike.   Eastern Equine Encephalitis (“Triple E”) has been recognized for decades in this area.  In the equine population, the virus is transmitted when a mosquito takes a blood meal from a bird infected with either disease, and then feeds on a horse.  While many horses exposed to WNV or Triple E experience no signs of illness, the virus can cause inflammation of the brain and spinal cord.  In some cases, especially in older horses, WNV and Triple E can be fatal.

With the mild winter and now wet spring, experts are predicting an early and potentially high mosquito population and a higher than normal likelihood of both of these diseases.  Public health officials are already making warnings to people to protect themselves from mosquito bites.  Our horses, though, are much more likely to be bitten and are often infected a few weeks prior to the first human cases.

Reducing Your Horse's West Nile and Triple E Risk

As a horse owner, prevention is the key to reducing your horse’s risk of contracting WNV or Triple E.  Follow these guidelines from the American Association of Equine Practitioners (AAEP) to protect your horse against these deadly viruses:

  1. Vaccinate your horse against these diseases.  In February 2003, a West Nile vaccine was licensed by the United States Department of Agriculture’s Center for Veterinary Biologics for use in healthy horses as an aid in the prevention of the disease.  The Triple E vaccine has been available and improved on for many years.  Talk with your veterinarian about the most appropriate vaccination schedule for your horse.
  2. Eliminate potential mosquito breeding sites.  Dispose of old receptacles, tires and containers and eliminate areas of standing water.
  3. Thoroughly clean livestock watering troughs at least monthly.
  4. Use larvicides to control mosquito populations when it is not possible to eliminate particular breeding sites.  Such action should only be taken, however, in consultation with your local mosquito control authority.
  5. Keep your horse indoors during the peak mosquito activity periods of dusk to dawn.
  6. Screen stalls if possible or at least install fans over your horse to help deter mosquitoes.
  7. Avoid turning on lights inside the stable during the evening or overnight.
  8. Using insect repellants on your horse that are designed to repel mosquitoes can help reduce the chance of being bitten.
  9. Remove any birds, including chickens, located in or close to a stable.
  10. Don’t forget to protect yourself as well.  When outdoors in the evening, wear clothing that covers your skin and apply plenty of mosquito repellent.           

Adapted and reprinted with permission from the American Association of Equine Practitioners.

For more information about please contact our office at 781-585-2611

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