福建省福寿螺感染广州管圆线虫的调查研究

目的调查福建省福寿螺的分布和自然感染广州管圆线虫情况，为今后控制该病提供科学依据。方法将福建省分为东、西、南、北、中5个片区，每片区择一定数量的县、市。以网兜捕捞福寿螺，每县、市采集100个以上，带回室内逐个挑出软体用匀浆法或螺肺压片法，镜检广州管圆线虫幼虫。结果全省5个片区中，均发现自然感染，平均感染率为23．76％（915／3851）；感染率超过30％的有8个县、市，以闽侯县为最高，达42．00％（52／124），最低为漳平市，仅3．77％（2／53）。不同孳生环境中，以孳生水沟者感染率最高，为30．81％（537／1743），最低为池塘，11．21Voo（63／562）。闽中片感染率最高，达28．03％（551／1966），闽西片最低，仅5．06％（12／237）。螺的感染率与距民宅远近密切相关，越靠近民宅者感染率越高（；[2—94．24，P〈O．001）。各地市场和餐馆销售的福寿螺感染率，分别为4．11％（23／559）和11．51Voo（68／501）。不同重量的福寿螺自然感染率与个体重量成正比（y。一238．32，P％0．001）。结论证实福建省的福寿螺已遍及全省各地、市，是目前我国发现该螺分布最广、感染广州管圆线虫最高的省份。

Investigation on the natural infectious status of Angiostrongylus cantonensis in Pomacea canaliculata in Fujian Province

In order to investigate the distribution of Pornacea canaliculata and the natural infectious status of An giostrongylus cantonensis in Fujian Province, so as to provide basis for angiostrongyliasis cantonensis prevention and control, the area of Fujian was divided into five regions. A certain number of counties were investigated in each region, and more than one hundred of Pornacea canaliculata were caught by tuck net in each county. The mollusks were selected one by one, and then the Angiosttvngylus cantonensis were observed by microscope using homogenisation or compression. The status of natural in- fection for Pornacea canaliculata in 29 counties were investigated, and the average infection rate was 23.76 % （915/3 851） ; in which, the infection rates of eight counties were more than 30%/00, the highest infection rate was 42% （52/124） in Minhou of Fuzhou, and the lowest infection rate was 3.77%（2/53） in Zhangping of western Fujian. In all kind of breeding environment of Pornacea canaliculata, the highest infection rate was 30.81 % （537/1 743） in ditch, and the lowest infection rate was 11.21% （63/562） in pond. The highest infection rate was 28.03%/00 （551/1 966） in central Fujian, and the lowest infection rate was 5.06 % （12/237） in western Fujian. The natural infection rate of Pornacea canaliculata was closely related to the different dis tances between breeding grounds and residential areas--the shorter the distance was, the higher the infection rate grew（χ^2= 94.24, P〈0. 001）, The natural infection rate of Pomacea canaliculata soled in the market and the restaurant were 4.11%（23/ 559） and 11.51% （68/591） respectively. The natural infection rate was increased with the weight of Pomacea canaliculata （χ^2 =238. a2, P〈0.001）. Results demonstrated that Pornacea canaliculata was detected in all counties of Fujian, which indicated that Fujian is one of the provinces which have a wide distribution of Pornacea canaliculata and the highest infection rate of Angiostrongylus cantonensis in China.