A horse in Yakima County has been diagnosed with the West Nile Virus.
Officials from the Department of Agriculture say the owner of a 7-year-old quarter horse gelding is monitoring the horse's progress for recovery. There is no effective treatment for the horse other than to be supportive.
West Nile Virus is fatal to horses in about one-third of the cases where clinical signs are apparent.
The owner says the horse had been recently pastured in Outlook and 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 25.
This is the only confirmed case of West Nile Virus in a Washington horse this year.