1994年4月27日于广西梧州市苍梧县一山区中学女生中，发生一起病因不明，以头晕、头痛、口干、四肢疼痛并有麻木感为主要自觉症状但无阳性体征的疾病流行，对此我们进行了现场调查。1基本情况该中学为农村初级中学，学生来自全镇所有行政村。边远农村学生在校住宿，女生45人分 On April 27, 1994, in the middle school girl of Yishan District, Cangwu County, Wuzhou City, Guangxi Province, a disease epidemic with dizziness, headache, dry mouth, pain in the extremities, and numbness as the main subjective symptom but no positive signs occurred. We conducted a site survey on this. 1 Basic Conditions The secondary school is a junior secondary school in rural areas and students come from all administrative villages in the town. Out-of-town rural students stay in school with 45 female students