一、流行性乙型脑炎急性期时腰穿压力大都增高(200～250mm H_2O),有时可高达300mm H_2O。80%病例的脑脊液无色、透明,有时可见Tindal现象(太阳微尘),久置可产生较粗的纤维素网。脑脊液白细胞增加,大多为30～100/mm~3,少数可达500/mm~3,个别在1000/mm~3以上,甚至可高达3,100/mm~3(多见于发病第2～5天)。白细胞数的多少主要取决于蛛网膜下腔细胞浸润的程度,这反映脑炎时脑组织渗出性病变的情况。急性期时中性粒 First, the acute phase of Japanese encephalitis lumbar puncture pressure is mostly increased (200 ~ 250mm H_2O), and sometimes up to 300mm H_2O. Cerebrospinal fluid is colorless and transparent in 80% of cases, and the Tindal phenomenon (solar dust) can sometimes be seen. For a long time, coarse cellulose fibers can be produced. Cerebrospinal fluid white blood cells increased, mostly 30 ~ 100 / mm ~ 3, a few up to 500 / mm ~ 3, individual in 1000 / mm ~ 3 or more, and even up to 3,100 / mm ~ 3 (more common in the onset of 2 to 5 days) . The number of white blood cells mainly depends on the degree of subarachnoid infiltration, which reflects the encephalitis brain tissue exudative lesions. Acute neutropenia