Thirty-one states have reported detecting West Nile virus (WNV) in 2006, according to the latest data reported on the U.S. Geological Survey web site (last updated July 25). The disease has infected horses in 10 states: Colorado, Idaho, Iowa, Kansas, Missouri, North Dakota, Texas, Utah, Wisconsin, and Wyoming.

Human cases have been reported in California, Colorado, Idaho, Indiana, Iowa,

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