West Nile Virus Confirmed in Horse in Yakima County - NBC Right Now/KNDO/KNDU Tri-Cities, Yakima, WA |

West Nile Virus Confirmed in Horse in Yakima County

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YAKIMA, Wash. - The Washington State Department of Agriculture says a case of West Nile virus has been confirmed in a horse in Yakima County. 

The DOA says the owner of a 7-year-old Quarter horse gelding is monitoring the horse's progress for recovery. Other than being supportive, there is no effective treatment for the horse.

West Nile virus is fatal to horses in about a third of the cases where clinical signs are apparent.

The owner says the horse, recently pastured in Outlook, has no history of travel out of the area and has no vaccination history.

The Washington Animal Disease Diagnostic Laboratory in Pullman reported the positive test results to the State Veterinarian's Office on September 25th. So far, this is the only confirmed case of West Nile virus in a Washington horse this year.

Washington had 72 West Nile virus cases in horses in 2009, but none in 2010 or 2011. Last year, a horse pastured near Grandview was euthanized after it became ill with the disease.

West Nile virus is spread by mosquitoes that have fed on infected birds. The disease sickens people, horses, birds and other animals, but it does not spread from horses to people or other animals.

The State Veterinarian's Office recommends spring as the best time to vaccinate horses against West Nile virus or obtain booster shots. Veterinarians who learn of potential West Nile Virus cases in horses or other animals should contact the State Veterinarian's Office.