sentences:  Central nervous system signs include a localized involuntary twitching of muscles or groups of muscles, seizures with salivation and jaw movements commonly described as "chewing-gum fits", or more appropriately as "distemper myoclonus".As the condition progresses, the seizures worsen and advance to grand mal convulsions followed by death of the animal.The animal may also show signs of sensitivity to light, incoordination, circling, increased sensitivity to sensory stimuli such as pain or touch, and deterioration of motor capabilities.