摘要
目的 掌握西昌试区沟渠钉螺的分布特点。方法 用全球定位系统 (GPS)和地理信息系统 (GIS)绘制的沟渠地图指导查螺 ,采用系统抽样法查螺 ,框距 10 m,压碎法检查钉螺血吸虫感染情况 ,并计数感染性钉螺体内的尾蚴数。结果 2 0 0 2、2 0 0 3年分别在 10个自然村的 4 4 7条和 4 39条沟渠查螺 ,平均活螺密度分别为 1.2 3只 / 0 .1m2和 1.4 1只 / 0 .1m2 ,钉螺感染率分别为 0 .4 6 %和0 .2 5 %。阶梯地、农毛渠、土沟和有草沟等环境的钉螺明显多于平坝、斗支渠、硬化沟和无草沟。在硬化斗渠中仅查出 1只感染性钉螺。感染性钉螺在沟渠中的分布有聚集性 (χ2 =5 2 .6 3,P<0 .0 1)。平均 1只感染性钉螺含尾蚴 1194条。结论 西昌试区的钉螺和感染性钉螺主要分布在有草的土质农。
Objective To explore the dist ri bution of Oncomelania snails in ditches in the G IS experimental areas in Xichang, Sichuan Province. Methods [ WT5”BZ]According to the ditch map drawn with GPS and GIS, the snail surve y was carried out with the one by one frame (0.1 m2) method at 10 m interval i n the ditches. All snails in the frame were captured. The snails were dissected to identify the infected snails. The number of the cercariae in the infected sna ils was counted. Results The ditches surveyed f or the snails were 447 and 439 respectively in the 10 villages in 2002 and 2003. The average densities of snails were 1.23 snails per frame and 1.41 snails per frame, and the infectious rates of snails were 0.46% and 0.25% in the two years, respectively. The snails in terrace, Nong and Mao ditches, muddy ditches and t he ditches with weed were significantly more than those in tableland, Dou ditche s, cement ditches and ditches without weed. Only 1 infected snail was found in a cement Dou ditch. An aggregation was observed in the distribution of infected snails in the ditches (χ2=52.63, P<0.01). Th e average number of cercariae in an infected snail was 1194. [WT 5”HZ]Conclusion The snails and infected snails distribute mainly in the muddy Nong and Mao ditches with weed in the basin in Xichang. [
出处
《中国血吸虫病防治杂志》
CAS
CSCD
2004年第5期359-362,共4页
Chinese Journal of Schistosomiasis Control
基金
美国国立卫生研究院 ( NIH)资助项目(NIH-NIAID1R0 1-AI43 962 )~~
关键词
钉螺
沟渠
分布
四川
Oncomelania snail
Ditch
Distribution
Sichuan
