广州管圆线虫疫源地感染度分级的研究

Study on the infectivity of Angiostronglus cantonensis in the epidemic foci

目的探索分析广州管圆线虫疫源地轻重程度及计算方法。方法取浙江省温州、苍南、永嘉、乐清市以及福建省闽侯、长乐、宁德市7个广州管圆线虫疫源地中间宿主(福寿螺)的感染率及阳性者平均含虫数之乘积为当地的感染指数。结果7个疫源地中间宿主福寿螺的感染率分别为10.59%(9/85)、60.74%(181/298)、34.96%(79/226)、32.90%(76/231)、57.50%(184/320)、40.00%(82/205)和17.65%(12/68);感染度分别为6.57、183.54、121.73、93.45、276.36、76.08和12.65。结论以感染指数>75、30～75、5～29、<5和0分别为超高度、高度、中度、低度和非疫源地。

Objective To analyze the degrees on the epidemic foci of Angiostronglus cantonensis and to explore the measurement methods. Methods Snails （Pila gigas ） were collected from the spots of Wenzhou, Cangnan, Yongjia, Yueqing in Zhejiang province and Minhou, Changle, Ningde in Fujian province. The snails were examined microscopically in order to calculate their infection rates and the average worm number in the positive snails, then taking the product of multiplication of both values as infestation index. Results The infection rates of the epidemic loci were 10.59 % （9/85）, 60.74 % （ 181/298）, 34.96 % （79/226）,32.90% （76/231）,57.50% （184/320）,40.00% （82/205）, 17.65% （12/68） and the rates of infectivity were 6.57、183.54、121.73、93.45、276.36, 76.08、12.65, respectively. Conclusion The epidemic foci were divided into five ranks （super, high, mld-range, low and non-epidemic foci） according to the value of infestatlon index which ranked from 〉 75、30-75、5-29、 〈 5 to 0.