1991年5月，石滚河乡中学发生一起沙眼暴发流行。为此，我们对该校三个年级9个班级共444名学生进行了调查，其中沙眼患者有298例，患病率高达67．1％，现将调查结果分析如下：1一般卫生学调查444名学生中有250名在同一池塘里洗脸，有26名取该池塘水洗脸，占总人数的62．2％。2 May 1991, Stone River Township middle school with a trachoma outbreak. To this end, we conducted a survey of 444 students in 9 classes of three grades in the school, of which 298 cases of trachoma patients, the prevalence rate as high as 67.1%, the survey results are as follows: 1 General Health Survey 444 Of the students, 250 were in the same pond and 26 were water-washed in the pond, accounting for 62.2% of the total. 2