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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、毛渠中
Objective To understand the distribution characteristics of canis in Xichang. Methods The ditches maps drawn by GPS and GIS were used to guide the investigation of snails. The systematic sampling method was used to check the snails. The frame distance was 10 m. Crush method was used to check the infection status of snail schistosomiasis. The number of cercariae. Results The average live lobe density of 4 4 7 and 4 39 ditches in 10 natural villages in 2001 was 1.2 3 /0.1m2 and 1.4 1 /0.1m2, respectively , And the infection rates of snails were 0.46% and 0.52% respectively. Stepped, nongdaqu, soil ditch and grass ditch and other environmental snails were significantly more than Pingba, bucket branch canal, hardened ditch and grassless ditch. Only 1 infectious snail was detected in the hardened cannel. The distribution of infectious snails in trenches was clustered (χ2 = 52.63, P <0.01). An average of only infecting snails containing 1194 cercariae. Conclusion The snails and infecting snails in Xichang were mainly distributed in grassy soil and furrow