| http://www.w3.org/ns/prov#value | - While many (90 percent) of horses infected with West Nile virus do not develop any illness, of those that do, between 40 and 60 percent die or need to be euthanized.14 Clinical signs of disease in horses include stumblin, incoordination, partial paralysis, muscle twitching, and behavior changes such as depression or apprehension.
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