Abstract: 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, Haplorchis pumilio and Centrocestus taiwanense. The overall infection rate in the population was 4. 6% (81/1 774). 33.7% of the the infected persons were contracted with 2 or 3 species of the trematoes. Eleven species of fishes comprising Pseudorasbora parva were identified as the second in termediate hosts, with an average positive rate of 49.1% (169/344). Metacercariae of different species were found to parasitize different parts of fishbody. Dog, cat, Rattus norvegicus and Rattus losea were detected to be the reservoir hosts, the total infection rate being 53.5% (23/43). CONCLUSION: There are 5 major species of fish-borne trematodes which may cause mixed infections in the study regions. Actually, infections of these trematodes in situ are more prominent in animals. This is the first report on human infection of Haplorchis pumilio in our country.

Key words: Echinochsmus fujianensis, fish trematode, mixed infection