Chin J Schisto Control ›› 2020, Vol. 32 ›› Issue (5): 506-.

### Survey of snail distribution in Four-lake Basin of Hubei Province

SHAN Xiao-Wei, XIAO Ying*, LIU Si*, ZHONG Chen-Hui

1. Hubei Provincial Center for Disease Control and Prevention, Wuhan 430079, China
• Online:2020-11-04 Published:2020-11-04

### 湖北省四湖流域钉螺分布调查

1. 湖北省疾病预防控制中心（武汉430079）
• 作者简介:单晓伟，男，硕士，主管医师。研究方向：血吸虫病流行病学
• 基金资助:
湖北省卫生计生委科研项目（WJ2017X009）

Abstract: Objective　To investigate the distribution of Oncomelania snails in Four Lake Basin of Hubei Province, so as to provide scientific evidence for the development of snail control interventions. Methods　The snail distribution was surveyed by means of the retrospective study and cross?sectional survey in the Four Lake Basin in Spring of 2016. The data pertaining to the endemic situation of schistosomiasis were collected and analyzed in the Four Lake Basin from 2008 to 2018, and the associations of snail habitat areas with the prevalence of Schistosoma japonicum in humans and bovines were examined. Results　There were 16 003 snail habitats in the 9 schistosomiasis?endemic counties (districts) in the Four Lake Basin in 2016, covering an area of 246 million m2. The mean density of living snails was 0.622 5 snails/0.1 m2, which was relatively high in weed?type settings (0.688 0 snails/0.1 m2) and ditches (0.706 4 snails/0.1 m2). Type I (current snail habitats, 53.03%) and II/III (historical snail habitats, 46.97%) settings were predominant snail habitats. A big change was seen in snail habitats in dry farmland, marshland and paddy farmland, and environmental modification resulted in satisfactory snail control effectiveness. In addition, the area of snail habitats positively correlated with the changes in the prevalence of S. japonicum infections in humans (r = 0.842, P < 0.01) and livestock (r = 0.695, P < 0.01). Conclusions　The integrate strategy with an emphasis on the control of the source of S. japonicum infections results in remarkable snail control effectiveness in the Four Lake Basin; however, there is a risk of re?emerging snail habitats.

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