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  • Title: [Study on distribution status of Oncomelania hupensis - intermediate host of Schistosoma japonicum in Jiangxi Province I Analysis of distribution of O. hupensis in Poyang Lake area].
    Author: Fei H, Shang-Biao L, Yi-Feng L, Zhao-Jun L, Jun G, Min Y, Zhe C, Yue-Ming L, Dan-Dan L.
    Journal: Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi; 2017 Aug 29; 29(5):544-549. PubMed ID: 29469345.
    Abstract:
    OBJECTIVE: To grasp the distribution status of Oncomelania hupensis snails in Poyang Lake area, so as to provide the evidence for formulating and adjusting the schistosomiasis prevention and control strategy in lake areas. METHODS: The vector grid was created and sampled randomly by 200 m × 200 m in the spatial database of grassland, and the distribution of snails was investigated in the selected grid by using the method of mechanical sampling by 50 m × 50 m. At the same time, the elevation of investigation points was extracted based on the topographic map of Poyang Lake. RESULTS: Totally 949 and 210 investigation points were collected from the south and north of Poyang Lake areas, accounting for 3.04% and 3.21% of all the investigation points in the respective region. The number of investigation points, the appearance rate of snail frame, and the average density of alive snails were 15 231, 8.15%, and 0.463/0.1 m2, respectively. The elevation of snail distribution area of the south and north Poyang Lake areas were 11-16 m and 9-16 m respectively. The elevation of concentrated snail belts of the south Poyang Lake area were 12-13 m and 15-16 m, and the elevation of concentrated snail belts of the north Poyang Lake area was 12-14 m. CONCLUSIONS: The distribution of snails is in the range of 9-16 m. The suitable habitats of snail breeding are moving from the south Poyang Lake area to the north Poyang Lake area, and from high elevation to low elevation. In the future, the schistosomiasis prevention and control measures could be formulated based on the geographical characteristics of current snail distribution in order to consolidate the achievements of schistosomiasis control. [摘要]目的 掌握鄱阳湖区草洲钉螺分布现状, 为制订和调整湖区血吸虫病防治对策提供依据。 方法 对鄱阳湖区 草洲空间数据库按200 m × 200 m创造矢量网格, 对网格进行随机抽样, 并对抽取的网格以50 m × 50 m开展系统抽样法 调查螺情; 同时以2009年鄱阳湖区湖底地形图为基础提取所有调查螺点的高程数据, 分析有螺点的平均高程和极值, 明 确钉螺在草洲分布高程范围。 结果 鄱阳湖区南湖和北湖分别选取网格样本949个和210个, 占各自区域总样本的 3.04%和3.21%; 共调查螺点15 231框 (每框面积为0.1 m2), 有螺框出现率8.15%, 活螺平均密度为0.463只/0.1 m2; 鄱阳湖 区南湖和北湖有螺区域高程分布分别为11～16 m和9～16 m, 南湖密螺带分布高程为12～13 m和15～16 m, 北湖密螺 带分布高程为12～14 m。 结论 鄱阳湖区草洲钉螺分布在9～16 m的高程范围内, 湖区适宜钉螺孳生, 繁殖生境已向鄱 阳湖北部及下高程区移动。在今后的血吸虫病防治工作中, 可依据现行钉螺孳生的地理特点, 制定出更为科学的防治措 施, 进一步巩固血吸虫病防治成果。.
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