The attack of (1) lasted for several days. There are clinical manifestations of early localized encephalitis or meningitis, and the number of cells in cerebrospinal fluid is slightly increased and the protein is slightly higher. Neutrophils in the blood increase and move to the left.

(2) The incubation period ranges from 10 days to several weeks, and most of them have no obvious symptoms, such as mild headache, fatigue, loss of appetite, and few words.

(3) The duration of symptoms is different. At this time, the abscess has formed and gradually increased, with the following symptoms: ① Poisoning symptoms. ② Symptoms of intracranial hypertension. ③ Symptoms of lesions.

(4) At the end stage, he often died of ventriculitis and diffuse meningitis caused by brain hernia or abscess breaking into the ventricle.