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1993年5月，垫江县某中学短期内连续发生了19例伤寒病人，经流行病学调查，证实为一起食物型伤寒爆发。现将调查情况分析如下。l基本情况全校1471入，其中教职1156入，学生1315入，学生全部住宿。初高中各3个年级。学生与教职工分别在两个食堂就餐。学生食物由一大厨房制备，发
May 1993, a middle school in Dianjiang County, a continuous short-term 19 cases of typhoid fever patients, epidemiological survey confirmed as a typhoid outbreak. Now the investigation of the situation is as follows. l The basic situation 1471 into the whole school, including teaching staff 1156, 1315 into students, all accommodation. Junior high school in each of the three grades. Students and faculty dine in two canteens respectively. Student food prepared by a large kitchen, hair