In 2002, Washington confirmed its first two equine cases of West Nile virus (WNV) in Pierce and Thurston counties. The disease was not seen again until 2005, when one positive horse was found in Yakima County. In 2006, six cases were confirmed, the first during August in a horse from Yakima County. By the year's end, four others were diagnosed from Yakima County and one from King County.
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