The onset of this disease may resemble the prodromal period of icteric hepatitis . 它的发病与黄疸型肝炎的前驱期相似。
2.
Violent model : cent period , prodromal stage , excitement period and paralytic period 狂暴型：分三期，前驱期、兴奋期和麻痹期。
3.
Results : a prodromal phase of local back pain occurred in all patients , with duration from 1 to 10 months , followed by a second phase of rapidly progressive signs of cord compression 结果：病患于前驱期会先有1到10个月的背痛，接著发生急遽恶化之脊髓压迫症状。
4.
Excitement period is entered namely after prodromal stage , expression is violent uneasiness , atttack person and other animal actively , consciousness is disorder , larynx flesh is paralytic 前驱期后即进入兴奋期，表现为狂暴不安，主动攻击人和其它动物，意识紊乱，喉肌麻痹。
5.
Depressed of spirit of prodromal stage expression , happy event is afraid of light is dark , unresponsive , do not listen to host to call , do not wish to contact a person , appetite abnormality , happy event bite take a foreign matter , deglutition crane is difficult , salivary grow in quantity , hind drive is faint , pupil comes loose big 前驱期表现精神沉郁、怕光喜暗，反应迟钝，不听主人呼唤，不愿接触人，食欲反常，喜咬吃异物，吞咽伸颈困难，唾液增多，后驱无力，瞳孔散大。
