闽北广州管圆线虫病自然疫源地的调查

Investigation on epidemic focus of Angiostrongylus cantonensis in northern Fujian

目的了解闽北广州管圆线虫病疫源地的分布与中间宿主等感染情况。方法在闽北辖区内10个县(市、区)采集中间宿主和转续宿主,以肺检法检测福寿螺,组织匀浆法检测蛞蝓、蜗牛、蛙等感染广州管圆线虫Ⅲ期幼虫;解剖家鼠,检查心肺血管中广州管圆线虫成虫感染率。结果在中间宿主和转续宿主中均检出广州管圆线虫Ⅲ期幼虫,福寿螺平均阳性率为14.78%(482/3 262);蛞蝓为28.76%(237/824),蜗牛为12.62%(41/325);蛙类为20.08%(43/212)。建瓯、浦城和松溪3个县(市)捕获的4种家鼠中,有3种感染有广州管圆线虫,平均感染率为13.39%,以褐家鼠感染率最高,为18.06%;黄胸鼠次之,感染率为6.12%;以肺动脉检出最多,占91.25%,心脏仅占8.75%。采集新鲜鼠粪52份,阳性10份,阳性率为19.23%。结论闽北为广州管圆线虫病自然疫源地,广州管圆线虫病对该地区居民身体健康的潜在危害不容忽视。

To understand the distribution status and infectious situation of intermediate hosts in natural foci of angiostrongyliasis in northern Fujian,intermediate and paratenic hosts were collected in 10 counties/cities/districts in the area.Infection for Ⅲ stage larvae of A.cantonensis was detected by lung examination in apple snails,and by tissue homogenate in slugs,snails,and frogs.Rodents were dissected to detect the adult infection rate of A.cantonensis in vessels of hearts and lungs.Ⅲ stage larvae of A.cantonensis was detected in both intermediate and paratenic hosts,and the average positive rate of apple snails,slugs,snails,and frogs were 14.78%（482/3 262）,28.76%（237/824）,12.62%（41/325）,and 20.08%（43/212）,respectively.Among the four kinds of rodents captured in three counties/cities as Jian＇ ou,Pucheng,and Songxi,three of them were infected with A.cantonensis and with an infection rate of 13.39 percent on average.Rattus norvegicus had the highest infection rate of 18.06%,following by 6.12% for Rattus flavipectus.Detection rate was 91.25% in pulmonary artery,while only 8.75% in heart.The positive rate of fresh mouse droppings was 19.23%（10/52）.It＇s indicated that north Fujian is the natural foci of A.cantonensis,and the potential hazards for this disease to health of local residents could not be ignored.