瑞昌市2007-2010年钉螺消长动态

Analysis on the dynamic distribution of snails in Ruichang City during 2007-2010

目的分析瑞昌市钉螺消长态势，为制订新的灭螺策略提供科学依据。方法采取回顾性调查的方法，收集2007--2010年瑞昌市春季钉螺调查数据，建立数据库，分析不同年份有螺面积、螺点和阳性螺点变化情况。结果2007--2010年有螺乡镇数和有螺村数变化不大；有螺面积略有减少，依次为705．6、645．5、616．0、608．5hm。（1hm。=10000m2），4年累计消灭钉螺面积97．1hm2；螺点数依次为494、773、875、894个，依次上升了279、102和19个，环比依次上升了56．5％、13．2％和2．2％；分别于2007年高丰镇和2009年范镇各查获1个阳性螺点，2008年和2010年全市未查获阳性钉螺。结论瑞昌市有螺面积呈逐年下降的趋势，且稳定在一定范围内。

Objective To analyze the dynamic distribution of snails, and explore the measures for schistosomiasis control and prevention in Ruichang City. Methods Data of snail investigation during 2007- 2010 were collected with retrospective investigation methods, and database was established for analyzing the changes of area, numbers of snail infested spot and positive snail infested spots. Results There were no significant changes on the number of towns and villages with snail. Areas of snail were 705.6, 645.5, 616.0, 608.5 hm2 （ 1 hm2 = 10 000 m2 ） respectively. Accumulate area of snail elimination was 97. 1 hm2 within 4 years. Number of snail infested spot were 494,773,875,894 respectively with 56.5%, 13.2% and 2.2% ascending rate per year. One positive snail infested spot was found in Gaofeng town in 2007 and in Fanzhen town in 2009 respeetively, and none was found in 2008 and 2010. Conclusion Snail infested area was reduced year by year being stable in a certain range in Ruichang City.