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Larval trematodes from Semisulcospira snails in Kyungpook Province, Korea
Dong Wik Choi,Doo Hong Ahn and Hee Sook Kim
Department of Parasitology, Kyungpook National University School of Medicine, Taegu, Korea.
Department of Pediatrics, Kyungpook National University School of Medicine, Taegu, Korea.
Abstract
In an attempt to determine the incidence of the cercarial larvae of trematodes, Semisulcospira snails collected in Judong stream, an endemic area of Paragonimus westermani, in Kyungpook Province, Korea, were examined from 1965 to 1980.
The infestation rate for cercariae in the snails was 5.4 per cent, but in 1970 dropped to 4.0 per cent and remained at the same level, 4.2 per cent, in 1975. It then decreased to 3.5 per cent in 1980.
Seven species of cercariae, Cercaria incerta(Kobayashi, 1992) Faust, 1924, Cercaria nipponensis(Ando, 1915) Faust, 1924, Cercaria yoshidae(Osafune, 1898) Cort et Nichols, 1920, Centrocestus armatus(Tanabe, 1922) Yamaguti, 1934, Metagonimus species, Notocotylus magniovatus Yamaguti, 1934, and Paragonimus westermani(Kerbert, 1878), and five kinds of undeterminced cercariae were found.
Of these, the most freqently emerged cercaria was Metagonimus species, folllowed by Notocotylus magniovatus. The least freqently emerged was Paragonimus westermani, with the rate of 0.04 per cent. The liberation rates in the five kinds of undetermined species varied from 0.04 to 0.15 per cent.
In the monthly liberaton rates for cercariae, the highest rate was encountered in May, and decreased in the period from June to November. It then somewhat increased again in December. There was no correlation in the liberation rate for cercariae and length of snails.
The results of this study indicate that the infestation of Semisulcospira snails with the cercariae of trematodes has decreased over the fifteen year period from 1965 to 1980.
Figures
Fig. 1 Map of Judong stream surveyed in Kachang myun, Dalseong county, Kyungpook Province, Korea
Plate 1 Microphotographs and the schematic figures of cercariae found from Semisulcospira snails (1mm=20µm).
Plate 2 Microphotographs and the schematic figures of cercariae found from Semisulcospira snails (1mm=20µm).
6. Notocotylus magniovatus 7. Paragonimus westermani 8. Cercaria A 9. Cercaria B 10. Cercaria C 11. Cercaria D
Tables
Table 1 Five-year-interval observations on proportions of Semisulcospira snails infested with larval flukes to non-infested snails collected in Judong stream, Kyungpook Province, Korea(1965~1980)
Table 2 Incidences of larval flukes from Semisulcospira snails in Judong stream, an endemic area of P. westermani in Kyungpook Province, Korea (1965~1980)
Table 3 Seasonal variation of cercariae from Semisulcospira snails collected in Judong stream, Kyungpook Province, Korea(1980)
Table 4 Relationships between liberation rates for cercariae and length of snails in 7 species of cercariae in 19,227 snails examined
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