福建省屏南县并殖吸虫第一中间宿主及其尾蚴感染情况调查

Investigation on the first intermediate host of Paragonimus and its cercaria infection in Pingnan County,Fujian Province

目的调查屏南县并殖吸虫第一中间宿主及其尾蚴感染情况,为当地预防并殖吸虫病提供依据。方法以并殖吸虫病例为线索,前往患者捕食生溪蟹地——福建省屏南县代溪镇天峰村溪坑内采集螺蛳标本,考察其孳生环境,并根据螺的形态学特征定种。采用直接压片法检查螺蛳并殖吸虫尾蚴感染情况,计算感染率,并对尾蚴进行形态学鉴定。结果共采集到3种螺蛳,经形态学鉴定为建瓯拟小豆螺、拟沼螺和放逸短沟蜷。共检查建瓯拟小豆螺2341只,查出并殖吸虫尾蚴阳性螺6只,感染率0.26%;检查拟沼螺1276只和放逸短沟蜷2215只,均未查到尾蚴。查出尾蚴经形态学鉴定为斯氏并殖吸虫的尾蚴。结论福建屏南县代溪镇天峰村是新发现的斯氏并殖吸虫病自然疫源地,需引起警惕。应加强并殖吸虫病相关健康教育宣传工作,防止斯氏并殖吸虫病在局部地区流行。

Objective To investigate the endemic status of the first intermediate host species of Paragonimus and its cercaria infection in Pingnan County for evidence to prevent paragonimiasis infection in the local area.Methods By the cases of paragonimiasis as clues,we collected the snail samples in the creek holes in Tianfeng village,Daixi Town,Pingnan County of Fujian Province,where the creek crabs were preyed the patients before infection.The snail habitats were observed,and the snail species was morphologically identified.The status of Paragonimus cercaria infection was examined by direct compression method,with the infection rate and morphology being calculated and identified.Results Totally,3 species of snails were collected,and identified as P.jianouensis,Assimenea,Semisulcospira libertine by their morphology.A total of 2341 P.jianouensis snails were examined,of which 6 were positive for Paragonimus cercariae,and the infection rate was 0.26%(6/2341),yet no cercariae were detected in 1276 Assimenea and 2215 Semisulcospira libertine snails.The cercariae were eventually identified as Paragonimus skrjabini.Conclusion Tianfeng village is a newly discovered natural focus for Paragonimus skrjabini.Our findings suggest that public health education on paragonimiasis should be strengthened in order to prevent the prevalence of paragonimiasis in the rural areas.