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1957年6月25日下午5时,青岛市某中学突然发生了急性胃肠炎。在该日下午7点30分以后,学生中有大批病人出现。26日下午,本市卫生防疫站取得25日早餐的咸大头菜叶标本一份,作了细菌学检验;其余二餐因已无剩菜,故未能采样检验。27日、28日,作者曾到该校进行了流行病学调查。当时,该校正值停课,准备考试,因而得以分别至各个班级直接向学生用填写调查表的方法,进行了普查,并采取了11名发病者及4名炊事员的粪
June 25, 1957 at 5 o’clock in the afternoon, a sudden secondary to acute gastroenteritis in Qingdao City. After 7:30 PM on that day, a large number of students appeared in the students. On the afternoon of the 26th, the Municipality’s Health and Epidemic Prevention Station made a list of salty kohlrabi leaf samples for breakfast on the 25th and made bacteriological tests. The remaining two meals were unable to sample for inspection because they had no leftovers. On the 27th and 28th, the author went to the school to conduct an epidemiological investigation. At that time, the correction was suspended and the exams were prepared so that censuses were made to the students directly to each class by completing the questionnaire, and the dung of 11 sick persons and 4 cooks was taken