1993年初夏，徐州市市郊某中专学校发生了一起以发热、头痛、乏力、全身肌肉酸痛为主要症状的疾病暴发流行。现将调查结果报告如下。1材料和方法1．1调查对家采用统一流调农，由专业防疫人员逐例调查；选择6月7、8二日学校门诊上症状典型的32例病人及周围20名“健康”者（年龄? The early summer of 1993, Xuzhou City, a secondary school in the suburbs with a fever, headache, fatigue, muscle soreness as the main symptom of disease outbreaks. The survey results are reported below. 1 Materials and Methods 1.1 The survey adopted a unified household flow of agriculture, by the professional epidemic prevention staff by case by case investigation; select the June 7, 8 two days outpatient clinic symptoms typical 32 patients and around 20 “healthy” ( age?