福建省建宁、屏南县并殖吸虫中间宿主感染情况调查

Investigation on intermediate host infection of Paragonimus in Jianning and Pingnan counties of Fujian Province

目的进一步了解福建省并殖吸虫中间宿主感染情况,为防治并殖吸虫提供依据。方法在福建省建宁县和屏南县分别采集并殖吸虫疫源地第一、二中间宿主,显微镜检查螺类肝脏,溪蟹经双筛水洗后镜检囊蚴,分析比较卫氏与斯氏并殖吸虫对第一、二中间宿主的选择差异及孳生地环境的不同。结果建宁县捕获第一中间宿主放逸短沟蜷感染率0.2%(5/2156);屏南县捕获第一中间宿主建瓯拟小豆螺感染率0.3%(6/2341),即卫氏并殖吸虫与斯氏并殖吸虫对其各自第一中间宿主的感染率差异无统计学意义(χ^(2)=0.027,P>0.05);建宁县福建华溪蟹感染率88.7%(63/71)高于屏南县的52.4%(22/42,χ^(2)=18.71,P<0.05);不同疫源地比较:建宁县雄性感染率(87.5%)、雌性感染率(93.3%)均高于屏南县的雄、雌感染率56.3%和40.0%,(χ^(2)=10.94,Fisher确切P=0.007,P均<0.05);卫氏并殖吸虫囊蚴感染度与感染福建华溪蟹体重量呈正相关(r=0.530,P<0.05),而斯氏并殖吸虫囊蚴感染度与感染蟹体重量相关系数无统计学意义(r=-0.391,P>0.05)。结论并殖吸虫各种属对第一中间宿主的选择有较高的特异性,而在第二中间宿主的选择上有其特点,但存在种属交叉现象。

Objective To further understand the infection status of intermediate hosts of paragonimus in Fujian Province,and to provide a basis for the prevention and control of paragonimus.Methods First and second intermediate hosts of Paragonimus were collected from Jianning County and Pingnan County of Fujian Province,respectively.Snail liver was examined by microscope,while the encysted metacercaria of crabs were examined by microscope after double-screen washing.The differences in the selection of first and second intermediate hosts by Paragonimus westermanni and Paragonimus skrjabini,as well as the environmental differences of their habitats,were analyzed and compared.Results The infection rate of the first intermediate host,Semisulcospira libertina,was 0.2%(5/2,156)in Jianning County,and the infection rate of the first intermediate host,pseudobythinella jianouensis,was 0.3%(6/2,341)in Pingnan County.There was no significant difference in the infection rates of the first intermediate hosts by Paragonimus westermanni and Paragonimus Stolsoni(χ^(2)=0.027,P>0.05).The infection rate of Sinopotamon fukienense was 88.7%(63/71)in Jianning County,which was higher than that in Pingnan County(52.4%,22/42,χ^(2)=18.71,P<0.05).The infection rates of male and female Sinopotamon fukienense were 87.5%and 93.3%,respectively,in Jianning County,which were higher than those in Pingnan County(56.3%and 40.0%,respectively,χ^(2)=10.94,Fisher's exact P=0.007,both P<O.05).The infection degree of Paragonimus zwestermanni was positively correlated with the body weight of infected crabs(r=0.530,P<0.05),but there was no such significant correlation found for Paragonimus Stolsoni(r=-0.391,P>O.05).Conclusion Various genera of Paragonimus had high specificity in selecting their first intermediate hosts,while they had distinct characteristics in selecting their second intermediate hosts,but there was a phenomenon of cross-infection between species.