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1985～1986年,我们在南洞庭湖区按照统一的方案,选择29个村(洲垸亚型24个,湖汊亚型3个,洲滩亚型2个:总人口20510人)进行了现场观察。同时,对1980～1986年期间住院治疗,并经病原学确诊为急性血吸虫病患者976例资料进行了流行病学分析。 一、80％以上的患者集中分布在防洪大堤500m以内。以防洪大堤为起点,以村民小组为单位,按居民住地与大堤的垂直距离远近划分为一层(0～200m)、二层(200～500m)、三层(500～1000m)、四层(1000m以外)。其病人分布特征为:(一)距大堤愈近,居民粪检阳性率愈高,感染度愈重。用尼龙袋集卵沉孵法对18456名3岁以上居民粪检结果,各层居民粪检阳性率和EPG为:一层23.55％(1916/
From 1985 to 1986, we selected 29 villages (24 embankment subtypes, 3 sub-lake subtypes, 2 sub-continental subtypes: 20,510 sub-types) in the South Dongting Lake area according to a unified plan and observed them on site . At the same time, epidemiological analysis of 976 cases of hospitalized patients who were diagnosed as acute schistosomiasis from 1980 to 1986 was conducted. First, more than 80% of patients are concentrated in the flood control embankment within 500m. Taking the flood prevention embankment as a starting point and the villagers’ group as the unit, the vertical distance between residence and embankment is divided into one layer (0 ~ 200m), the second floor (200 ~ 500m), the third floor (500 ~ 1000m) 1000m outside). The distribution characteristics of their patients are: (a) closer to the embankment, the higher the positive rate of fecal examination, the greater the degree of infection. The results of fecal seizures of 18,456 residents over the age of 3 with nylon bag-hatching method showed that the positive rate and EPG of fecal seizures were 23.55% (1916 /