某些疾病的初期阶段，主要症状尚未出现以前最早出现的发病征象，又称早期症状。
当出现前驱症状时，预示着病人可能在数小时或数日内出现大发作。
When prodromal symptoms, indicating that the patient may appear within hours or days as grand mal.
一般来说，潜伏期或前驱症状持续时间越短，症状越严重，死亡率越高。
Generally speaking, the incubation period or the premonitory symptoms duration is shorter, the symptom is more serious, the mortality rate is higher.
典型的甲型肝炎临床过程分四个阶段：潜伏期，前驱症状期，黄疸期，恢复期。
Clinical process divides typical armour hepatitis a phase: is preclinical, prodrome period, is icteric period, convalescence.
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