Chin J Schisto Control ›› 2020, Vol. 32 ›› Issue (6): 640-.

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Effect of integrated schistosomiasis control measures on Oncomelania snails in river channels connecting the Yangtze River in Nanjing City

XIE Chao-Yong*, WANG Yu, HE Yi-Sha, WEI De-Hui, XU Xiao-Lin   

  1. Nanjing Municipal Center for Disease Control and Prevention, Jiangsu Province, Nanjing 210003, China
  • Online:2020-12-08 Published:2020-12-08

南京市通江河道血防综合治理项目钉螺控制效果

谢朝勇*,王毓,何伊莎,魏德会,徐小林   

  1. 江苏省南京市疾病预防控制中心(南京210003)
  • 作者简介:谢朝勇,男,主任医师。研究方向:寄生虫病防治
  • 基金资助:
    江苏省南京市卫生计生委“十三五”重大项目(ZDX16020)

Abstract: Objective To evaluate the effectiveness of Oncomelania snails control following the implementation of integrated schistosomiasis control measures in river channels connecting the Yangtze River in endemic areas of Nanjing City. Methods The river channels connecting the Yangtze River with snails in Nanjing City were selected as the study pilots. The integrated schistosomiasis control measures implemented in the study pilots were investigated by means of retrospective analyses and field surveys from 1998 to 2019, and the effectiveness of snail control was evaluated. Results Integrated control measures with emphases on environmental improvements including water resource projects for schistosomiasis control were implemented in the study pilots during the period from 1998 to 2019, including river bank concretion with 84.51 km in length, marshland cutting and dredging with 50.41 km in length, building 2 sluices and 3 overflow dams, digging one floodway and snail control with chemical treatment that covered an area of 3 370.80 hm2. No Schistosoma japonicum infection had been detected in snails since the completion of the integrated control measures. In addition, snails had been eliminated in 6 river channels connecting the Yangtze River until 2019, with the snail habitats reducing from 214.33 hm2 to 52.22 hm2 in 10 river channels connecting the Yangtze River and the snail density reducing to below 0.1 snails/0.1 m2 in snail?breeding river channels connecting the Yangtze River. Conclusions  The integrated schistosomiasis control measures with emphases on environmental improvements may effectively control snail breeding and spread in rivers connecting the Yangtze River in endemic areas of schistosomiasis; however, the maintenance of the project and snail surveillance and control should be intensified following the completion of the integrated schistosomiasis control measures.

Key words: Schistosomiasis, Oncomelania snail, River channels connecting the Yangtze River, Integrated control, Nanjing City

摘要: 目的 了解南京市血吸虫病流行区通江河道实施血防综合治理后的钉螺控制效果。方法 选择南京市10条主要有螺通江河道,采用回顾性调查和现场调查相结合的方法,收集1998—2019年通江河道血防综合治理措施实施情况,评价钉螺控制效果。结果 1998—2019年,南京市10条主要通江河道先后实施了以环境改造为主的综合治理措施,共完成河岸砼护坡84.51 km、切滩清淤50.41 km、修建控水闸2座、修建滚水坝3条、开挖泄洪道1条,累计开展药物灭螺3 370.80 hm2。综合治理项目完成后,所有通江河道均未再查到血吸虫感染性钉螺。至2019年,已有6条河道消除了钉螺,河道内总有螺面积由214.33 hm2下降至52.22 hm2,有螺河道钉螺密度均降至0.1只/0.1 m2以下。结论 以环境改造等为主的血防综合治理措施,可有效控制南京市血吸虫病流行区通江河道钉螺孳生和扩散,但项目完成后仍应加强工程维护管理、钉螺监测和控制等工作。

关键词: 血吸虫病, 钉螺, 通江河道, 综合治理, 南京市

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