This rare genetic disorder is characterized by an uncoordinated or clumsy manner of walking and dystonia (a general term for a group of muscle disorders characterized by involuntary contractions). Symptoms usually become apparent around six years of age and may be more noticeable in the afternoon or evening than in the morning.
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Deer in many states have a brain-wasting disease that gives them zombielike symptoms. HowStuffWorks looks at the danger to humans.