福建棘隙吸虫与4种鱼源性吸虫混合感染的调查

SURVEY OF MIXED INFECTIONSOF ECHINOCHASMUS FUJIANENSIS AND OTHER FOUR SPECIES OF FISH-BORNE TREMATODES

目的 :调查福建棘隙吸虫等多种吸虫混合感染情况。方法 :采用改良加藤法或水洗过筛沉淀法粪检 ,对吸虫卵阳性人群和终宿主动物分别作驱虫与解剖观察 ,对鱼类宿主取鱼鳃和鱼肉等组织 ,镜检囊蚴。结果 :查出福建棘隙吸虫 ( Echinochasmus fujianensis)、华支睾吸虫 ( Clonorchissinensis)、日本棘隙吸虫 ( Echinochasmus japonicus)、钩棘单睾吸虫 ( H ap lorchis pumilio)和台湾棘带吸虫 ( Centrocestus taiwanense)等 5种 ;人群感染率为 4 .6% ( 81/ 1774 ) ,有 33.7%感染者同时感染 2种或 3种吸虫 ,第二中间宿主为麦穗鱼等 11种 ,感染率为 4 9.1% ( 169/ 34 4 ) ;不同吸虫囊蚴寄生鱼体部位不同 ;保虫宿主为狗、猫和 2种鼠类等 4种 ;混合感染率为 53.5% ( 2 3/ 4 3)。结论 :当地为兽主人次的鱼源性 5种吸虫混合感染区 ,人体自然感染钩棘单睾吸虫系首次报告。

AIM:To seek the possible existence of mixed infections of Echinochasmus fujianensis and other fish- borne trematodes.METHODS:Kato- Katz s method and sedimentation proce- dures were used to observe parasite ova in stool.Adult worms were expelled from infected persons after medication and obtained from definitive animal hosts upon dissection.Metacer- cariae of trematodes were detected from gills,muscles and some other tissues of fish after pressing them between two slides and examined under microscopy.RESULTS:Five species of trematodes were found,including Echinochasmus fujianensis,Clonorchis sinensis E.japonicus, H aplorchis pumilio and Centrocestus taiwanense.The overall infection rate in the population was4.6 % (81 / 1 774) .33.7% of the the infected persons were contracted with2 or3species of the trematoes.Eleven species of fishes comprising Pseudorasbora parva were identified as the second intermediate hosts,with an average positive rate of49.1 % (1 6 9/ 344) .Metacer- cariae of different species were found to parasitize different parts of fish body.Dog,cat,Rat- tus norvegicus and Rattuslosea were detected to be the reservoir hosts,the total infection rate being5 3.5 % (2 3/ 4 3) .CONCLUSION:There are5 major species of fish- borne trematodes which may cause mixed infections in the study regions.Actually,infections of these trema- todes in situ are more prominent in animals.This is the first report on human infection of H aplorchis pumilio in our country.