病例:男,4岁,因头痛、发热、意识障碍二天入院。患儿于1964年5月22日上午接受乙型脑炎疫苗注射,注射前身体健康,注射后数小时小孩出现高热、头痛、哭闹不安。第二天两下肢活动不灵,走路不稳,曾跌倒数次。精神不振,胃纳欠佳,颈项活动不自如,未经任何治疗。5月27日其母亲见患儿精神稍好转,将患儿送至托儿所。是日上午九时,患儿又接受皮下注射霍乱菌苗0.2毫升。下午2时小孩再出现高热、头痛、哭闹不安、表情痛苦、不思饮食。夜间 Case: Male, 4 years old, admitted to hospital for two days due to headache, fever and disturbance of consciousness. The children received JE vaccine injection on the morning of May 22, 1964, and they were healthy before injection. The children had fever, headache and cries of unease after hours of injection. The next day two lower extremity activities are not working, walking unsteadily, had fallen several times. Insanity, poor appetite, neck activities are not free, without any treatment. On May 27, her mother showed a slight improvement in her child’s spirit and sent her children to the nursery school. It was 9 o’clock in the morning and the children received another 0.2 mL of cholera vaccine subcutaneously. At 2 p.m. the child reappeared feverish, headache, crooks, painful expression, no diet. at night