### Classification and grading of environments with Oncomelania hupensis snails inside embankment of marshland and lake areas

PENG Xiao-wu1 |RONG Xian-bing1 |LI Ming-yan2* |ZHANG Hua-ming3 |LIU Heng-wu1 |WANG Jia-song1 |LIU Xiong3 |ZHANG Xia3 | CHEN Mei 3 | CUI Cai-xia3 | DONG Juan1 | GUO Shu1

1. 1 Institute of Schistosomiasis Prevention and Control|Jingzhou Municipal Center for Disease Control and Prevention| Hubei Prov? ince|Jingzhou 434000|China；2 Jingzhou Public Health Bureau|Hubei Province|China；3 Institute of Schistosomiasis Preven? tion and Control| Jiangling County Center for Disease Control and Prevention| Hubei Province|China
• Online:2014-02-22 Published:2014-02-22
• Contact: LI Ming?yan

### 湖沼地区垸内沟渠有螺环境分类定级研究

1. 1湖北省荆州市疾病预防控制中心 （荆州 434000）； 2 湖北省荆州市卫生局； 3湖北省江陵县血吸虫病预防控制所
• 通讯作者: 李明炎
• 作者简介:彭孝武| 男| 本科| 主任医师。研究方向： 血吸虫病防治
• 基金资助:
2013-2014 年度湖北省卫生厅支助项目 （XF2012?15）

Abstract: Objective To classify and grade the environments with Oncomelania hupensis snails inside embankment in marsh? land and lake areas，so as to improve the work efficiency and realize the systematic management. Methods The schistosomiasis endemic area Liaodi and Xiongdi villages in Jiangling County，Hubei Province were selected as the experiment villages，and the environments with snails in the two villages were divided into sections with a length of 500 m，then the snail situation were sur? veyed by the systematic sampling method with 10 m and 50 m a frame respectively. The environments were classified according to the discovery of infected snails and wild fecal contamination，and the numbers of sites with snails and their areas in different class? es were recorded. Meanwhile，the data of sites with infected snails in Jingzhou City during the recent 5 years were collected and graded according to the average density of snails，so as to discuss the correlativity between the grades of environments with snails and the numbers of sites with infected snails and the occurrence rate of frames with snails. Results There were 1 967 sites with in? fected snails in Jingzhou City during the recent 5 years，and there was a positive correlation between the grades of environments with snails and the occurrence rate of frames with snails（rs= 0.77，P＜0.01），when the grade was 5，the constituent ratio of num? bers of sites with infected snails was 3.1%，and when the grade was 2-3，the ratio raised to 56.3%. There were 39 sites with snails in the two villages，the Class 1，2 and 3 environments included 1， 18 and 20 sites，with the areas of 1 080， 51 640m2 and 41 220 m2 ， respectively. There were no statistically significant difference between the grades divided by snail survey with 10 m and 50 m a frame（χ2 ＝4.667，P＞0.05），but the time?consuming of the former was 3 times of the latter. Conclusions The classification and grading of the environments with snails inside embankment in marshland and lake areas can master the key point of the snail survey. The subsection and setting frames at a suitable distance can save time and manpower，improve work efficiency，as well as understand the distribution of snail status of the environment with snails，which can realize the sort management of the snail envi? ronments inside embankment.

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