广州市广州管圆线虫中间宿主感染调查*

目的 了解广州市广州管圆线虫中间宿主的感染情况。方法 采用人工消化法消化从广州市东、西、南、北、中各区收集的褐云玛瑙螺、福寿螺、中华圆田螺和同型巴蜗牛，对消化后的螺类材料中的广州管圆线虫第Ⅲ期幼虫进行观察和计数。结果 褐云玛瑙螺阳性率为13.27%（30/226）, 平均感染度为794条/只;同型巴蜗牛阳性率为2.86% (2/70)，平均感染度为115条/只。161只福寿螺和189只中华圆田螺无阳性检出。结论 广州市广州管圆线虫的自然疫源地中，褐云玛瑙螺占主导地位。不同区域褐云玛瑙螺的感染率差异较大。褐云玛瑙螺的感染度与其重量相关。

Investigation on intermediate host infected by Angiostrongylus cantonensis in Guangzhou City

To understand the natural infection profiles of A.cantonensis in intermediate host from Guangzhou， many intermediate hosts of A.cantonensis including Achatina fulica (A. fulica); Ampullaria gigas(A.gigas)；Cipangopaludina cahayensis and Bradybaena similaris ]are collected from the East, West, North, South, and Center part of Guangzhou and then they are chopped and digested by artificial digestive juices. After artificial digestion, larvae recovered from snails were identified and counted under microscopic. Through the analysis of data, the infection rate and average infection density of A. cantonensis in A. fulica were 13.27% (30/226) and 794 per snail, and 2.86% (2/70) and 115 for Bradybaena similaris. A. gigas and Cipangopaludina cahayensis were not infected in this survey. It’s suggested that A. fulica plays more roles in the natural focus of A. cantonensis in Guangzhou , and it also exhibited the infection rate of A. fulica varied at different areas of Guangzhou and the average infection density of A. fulica correlated with snails’ weight.