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Three morphological types of the genus Metagonimus encysted in the dace, Tribolodon taczanowskii, caught from the Sumjin River
J Y Chai,W M Sohn,*M H Kim,**S T Hong and S H Lee
Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-460, Korea.
Abstract
Three morphological types of the genus Metagonimus were found encysted in the dace, Tribolodon taczanowskii, caught from the Sumjin River, Korea. They include Metagonimus Yokogawa type (M. yokogawai), Miyata type, and Koga type according to Saito's classification.
The metacercariae were experimentally fed to rats and hamsters and a total of 1,624 Metagonimus worms were recovered from their small intestine. The number of each type was 820 for Yokogawa type, 688 for Miyata type, 46 for Koga type, and 70 undetermined. The major differential keys between Yokogawa and Miyata types were in the position of two testes, distribution of uterine tubules, and size of the eggs, and the keys between Miyata and Koga types were in the position of two testes, distribution of vitelline follicles, and size of the eggs. The validity of Miyata type as a specific level should be retained until more convincing evidences are obtained. Koga type is regarded as a synonym of M. takahashii.
The present results reveal that there are 3 morphological types of Metagonimus whose larvae are encysted in the dace, T. taczanowskii, from the Sumjin River.
Figures
Figs. 1-2 Fig. 1. The dace, Tribolodon taczanowhkii, caught from the Sumjin river, the second intermediate host 3 morphological types of Metagonimus.
Fig. 2. Two metacercariae of Metagonimus encysted on the scale of T. taczanowskii.
Figs. 3-4 Fig. 3. An adult specimen of Metagonimus yokogawai recovered from a rat, 14 days after experimental infection. Note the two adjacent testes(T), and distribution of uterine tubules and vitelline follicles(VF). Oral sucker(OS), ventral sucker(VS), ovary(OV), seminal vesicle(SV) and seminal receptacle(SR). Fresh proparation.
Fig. 4. An adult specimen of Metagonimus Miyata type recovered from a rat, 14 days after experimental infection. Note the two separated testes (arrows) and uterine tubule passing through the intertesticular junction. Also note the limited distribution of vitelline follicles near the posteriormost portion of the body. Fresh preparation.
Fig. 5. An adult specimen of Metagonimus Koga type (=M. takahashii) recovered from a rat, 14 days after experimental infection. Note the two separated tested (large arrows) and uterine tubule passing through the intertesticular junction. A peculiar feature of this type was extensive distribution of vitelline follicles even through the post-testicular (right) portion (small arrows). Fresh preparation.
Fig. 6. A young adult specimen of M. yokogawai recovered from a hamster, 7 days after experimental infection. Note the arrangement of two testes and distribution of vitellaria. Acetocarmine-stained.
Fig. 7. An adult specimen of Metagonimus Miyata type recovered from a hamster, 8 days after experimental infection. Note the separated testes, and vitellaria, Acetocarmine-stained.
Fig. 8. An adult specimen of Metagonimus Koga type (=M. takahashii) recovered from a hamster, 8 days after experimental infection. Note the arrangement of two testes, and distribution of uterine tubules and vitellaria. Acetocarmine-stained.
Tables
Table 1 Distribution of Metagonimus metacercariae by body portions of T. taczanowskii.
Table 2 Results of worm recovery* (Metagonimus) from experimental rats and hamsters
References
1.
Ahn YK, Ryang YS. [Epidemiological studies on Metagonimus infection along the Hongcheon river, Kangwon province]. Korean J Parasitol 1988;26(3):207–213.
2.
Asada J. Clin Med 1934;22(2):43–56.
3.
Chai JY, Cho SY, Seo BS. Study on Metagonimus yokogawai(Katsurada, 1912) in Korea: IV. An epidemiological investigation along Tamjin River basin, South Cholla Do, Korea. Korean J Parasitol 1977;15(2):115–120.
4.
Chai JY, Lee SH. Intestinal trematodes of humans in Korea: Metagonimus, heterophyids and echinostomes. Korean J Parasitol 1990;28 Suppl:103–122.
5.
Chun SK. Bull Fusan Fish Coll 1960;3(1):31–40.
6.
Ishii N. Tokyo Iji Shinshi 1959;7(3):149–151.
7.
Ito J. Progress of Med Parasit in Japan 1964;1:315–393.
8.
Joo CY, et al. Kyungpook Univ Med J 1982;23:1–9.
9.
Kang SY, et al. J Korean Med Ass 1964;7(5):470–476.
10.
Katsuta I. Taiwan Igakkai Zasshi 1932;31(2):26–39.
11.
Kim CH. [Study on the Metagonimus sp. in Gum river basin, Chungchung-nam Do, Korea]. Korean J Parasitol 1980;18(2):215–228.
12.
Kim CH, Kim NM, Lee CH, Park JS. [Studies on the Metagonimus fluke in the Daecheong reservoir and the upper stream of Geum river, Korea]. Korean J Parasitol 1987;25(1):69–82.
13.
Koga G. Igaku Kenkyu 1938;12(10):3471–3528.
14.
Komiya Y, et al. Jap J Parasitol 1958;7(1):7–11.
15.
Miyamoto K, et al. Jap J Parasitol 1978;27(5):445–452.
16.
Miyata I. Dobutsugaku Zasshi 1944;56(1-3):16–19.
17.
Saito S. Jap J Parasitol 1972;21(6):449–458.
18.
Saito S. Jap J Paratisol 1973;22(1):39–44.
19.
Saito S, et al. Jap J Parasitol 1968;17(3):167–174.
20.
Seo BS, Lee SH, Cho SY, Chai JY, Hong ST, Han IS, Sohn JS, Cho BH, Ahn SR, Lee SK, Chung SC, Kang KS, Shim HS, Hwang IS. An Epidemiologic Study On Clonorchiasis And Metagonimiasis In Riverside Areas In Korea. Korean J Parasitol 1981;19(2):137–150.
21.
Seo BS, et al. Seoul J Med 1971;12(4):234–241.
22.
Soh CT, Ahn YK. [Epidemiological Study On Metagonimus Yokogawai Infection Along Boseong River In Jeonra Nam Do, Korea]. Korean J Parasitol 1978;16(1):1–13.
23.
Soh CT, et al. Yonsei Rep Trop Med 1976;7(1):3–16.
24.
Song CY, Lee SH, Jeon SR. [Studies on the intestinal fluke, Metagonimus yokogawai Katsurada, 1912 in Korea Geographical distribution of sweetfish and infection status with Metagonimus metacercaria in south-eastern area of Korea]. Korean J Parasitol 1985;23(1):123–138.
25.
Takabayashi Y. Gifu Ika Daigaku Kiyo 1953;1(3):219–226.
26.
Takahashi S. Okayama Igakkai Zasshi 1929;41(12):2687–2775.
27.
Yeo TO, et al. Seoul J Med 1971;12(4):259–267.
28.
Yoshimura H, et al. Jap J Parasitol 1972;21(6):400–407.
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