Warning: mkdir(): Permission denied in /home/virtual/lib/view_data.php on line 81
Warning: fopen(upload/ip_log/ip_log_2024-11.txt): failed to open stream: No such file or directory in /home/virtual/lib/view_data.php on line 83
Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 84 An epidemiological study of metagonimiasis along the upper reaches of the Namhan River
An epidemiological study of metagonimiasis along the upper reaches of the Namhan River
J Y Chai,*1S Huh,2J R Yu,3J Kook,1K C Jung,4E C Park,5W M Sohn,6S T Hong,1 and S H Lee1
1Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea.
Received April 09, 1993; Accepted April 26, 1993.
Abstract
An epidemiological study of Metagonimus infection was undertaken along the upper reaches of the Namhan River, with special consideration on the species (type) of the worms collected from humans. Eggs of Metagonimus spp. were detected from 15 (9.7%) of 154 people examined in Umsong-gun, and from each infected person (5 cases) 6,015-24,060 worms (mean 13,233) were recovered after treatment with praziquantel (10 mg/kg). Eggs were also detected from 37 (48.1%) of 77 people in Yongwol-gun, from whom (27 cases) 1-4,965 worms (means 1,215) were collected. The worm from Umsong-gun consisted of both Metagonimus Miyata type and Metagonimus takahashii, whereas those from Yongwol-gun consisted of only Metagonimus Miyata type. When the uterine eggs of the two kinds and M. yokogawai (obtained from people in Tamjin River basin) were morphologically compared, it was suggested that the egg size should be a good indicator for discrimination of the species or type. The source of human infection was proved to be fresh water fishes; 49 of 52 Zacco platypus examined, 6 of 8 Hemibarbus longirostris, 13 of 15 Pseudogobio esocinus, 4 of 6 Odontobutis obscura interrupta, and 17 of 18 Carassius carassius were found infected with Metagonimus metacercariae. From the results, it is concluded that the upper reaches of the Namhan River are endemic foci of Metagonimus Miyata type and M. takahashii.
Figures
Fig. 1 Map showing the surveyed areas (area codes 1-6). 1. Hoingsong-gun (Hoingsong-up), 2. Yongwol-gun (Suju-myon), 3. Yongwol-gun (Chuchon-myon), 4. Tanyang- gun (Taehung-myon), 5. Chewon-gon (Hansu-myon), 6. Umsong-gun (Soi-myon). In the areas 3 and 6, both fecal examination of the inhabitants (H) and fish examination for Metagonimus metacercariae (F) were performed, and in the areas 1, 2, 4 and 5, only fish examination (F) was undertaken.
Figs. 2-7 Metagonimus miyata type (2-4) and M. takahashii (5-7) recovered from the inhabitants of Umsong-gun (under same magnification). 2. A fresh specimen showing the arrangement of genital organs and uterine eggs. Note the two separated testes and uterine tubule crossing the intertesticular junction, and limited distribution of the vitelline follicles near the posterior end of the body. 3. Another specimen recovered from a different person. 4. An acetocarmine stained specimen of the same type. 5. A fresh specimen showing its typical location of two testes, and abundant distribution of vitelline follicles. Also note the uterine tubule covering the left (and right) testis. 6. Another specimen recovered from a different person. 7. An acetocarmine stained specimen.
Fig. 8 The distribution patterns of the length and width of three kinds of Metagonimus eggs; M. yokogawai, Metagonimus Miyata type, and M. takahashii. Each dot represents the mean value of 10 intrauterine eggs of an adult worm.
Fig. 9 Schematic representation of three kinds of Metagonimus, showing the arrangement of genital organs; ovary (Ov), testis (T), seminal vesicle (Sv), seminal receptacle (Sr), and vitelline follicles (Vit). A: M. yokogawai, B: Metagonimus Miyata type, C: M. takahashii.
Tables
Table 1 Helminth egg positive rate by fecal examination of the inhabitants of Umsong-gun and Yongwol-gun
Table 2 Worm collection from the inhabitants after treatment with praziquantel
Table 3 Prevalence of Metagonimus sp. metacercariae in fresh water fishes collected from the upper reaches of the Namhan River
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, Lee SH. Intestinal trematodes of humans in Korea: Metagonimus, heterophyids and echinostomes. Korean J Parasitol 1990;28 Suppl:103–122.
5.
Chai JY, Sohn WM, Kim MH, Hong ST, Lee SH. Three morphological types of the genus Metagonimus encysted in the dace, Tribolodon taczanowskii, caught from the Sumjin River. Korean J Parasitol 1991;29(3):217–225.
6.
Chun SK. Bull Pusan Fish Coll 1960;3(1):31–40.
7.
Ito J. Progress of Med Parasit in Japan 1964;1:315–393.
8.
Katsuda I. Taiwan Igakkai Zasshi 1932;31(2):26–39.
9.
Kim CH. [Study on the Metagonimus sp. in Gum river basin, Chungchung-nam Do, Korea]. Korean J Parasitol 1980;18(2):215–228.
10.
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.
11.
Miyata I. Dobutsugaku Zasshi 1944;56(1-3):16–19.
12.
Saito S. Jpn J parasitol 1972;21(6):449–458.
13.
Saito S. Jpn J parasitol 1973;22(1):39–44.
15.
Saito S, et al. Jpn J parasitol 1982;31 Suppl.:64.
16.
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.
17.
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.
18.
Takahashi S. Okayama Igakkai Zasshi 1929;41(12):2687–2775.
PDF Links
Full text via DOI
Download Citation 
