• Parasites, Hosts and Diseases
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• v.45 no.1 s.141
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• pp.33-38
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• 2007

To know the prevalence of heterophyid trematodes among inhabitants of a southern coastal village, i.e., Sacho-ri, Gangjin-gun, Jeollanam-do(Province), 82 stool samples were examined on helminth eggs and protozoan cysts using Kato-Katz and formalin-ether sedimentation techniques. Total 33 people(40.2%) were positive for trematodes(Heterophyes nocens; 15 people, Pygidiopsis summa; 3, Metagonimus sp.; 4, Clonorchis sinensis; 7, Gymnophalloides seoi; 6) and/or protozoa(Entamoeba coli; 3). Among intestinal trematode egg positive cases, 17 were treated with praziquantel and their whole diarrheic stools were collected after purgation. Adult flukes of H. nocens(number of specimens=1,294), P. summa(386), Stellantchasmus falcatus(5), Stictodora lari(4), and Heterophyopsis continua(1) were collected using a stereomicroscope. To know the source of human H. nocens infections in this village, metacercarial infections in mullets(10) were examined and most H. nocens metacercariae(101/105, 96.2%) were found in the trunk portion. From above results, the surveyed coastal village has been newly known as an endemic focus of human H. nocens infection and consuming raw mullets was the presumable source of human heterophyid infections.

• Parasites, Hosts and Diseases
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• v.32 no.4
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• pp.267-270
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• 1994

To evaluate the status of clonorchiasis and metagonimiasis of the inhabitants near Talchongang (River) in Chungwon-gun, Chungchongbuk-do, the stools of 67 inhabitants were examined by formalin-ether sedimentation method from August to September, 1993. Also freshwater knish caught in Talchongang were examined by slide compression method. The e99 positive cases of Clonorchis sinenis and Metasonimus sp. were 22 (32.8%), and 14 (20.9%), respectively. Of 17 species of examined fish, 14 species were infected with C. sinensis and 13 species with Metagonimus sp. The adult worm collected from 2 patients after treatment with praziquantel was Metosoninur Miyata type. Also the adult worm obtained from the experimental mice infected with metacercariae from Zacco plntwpus was Metafonimus Miyata type. We found the highly endemic area of clonorchiasis and metagonimiasis along Talchongang.

• Parasites, Hosts and Diseases
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• v.40 no.1
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• pp.9-16
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• 2002

The endemic status of clonorchiasis and metagonimiasis along the Geum gang (River) in Okcheon-gun (County) in Korea was examined. From February to December 7000, stools of total 1,081 inhabitants living in 5 villages were examined. Each stool specimen was examined by both the cellophane thick smear method and the formalin-ether sedimentation technique. Egg-positive cases were further analyzed by Stoll's egg-counting technique. and praziquantel was administered to positive cases. The egg-positive rates for Clonorchis sinensis and Metafonimus species were 9.3% and 5.5%, respectively, and the double infection rate was 3.5%. The numbers of eggs per gram (EPG) of feces of C. sinensis and Metafoninus sp. were $918{\pm}1,463$ and $711{\pm}947$, respectively. The egg-positive rates for C. sinensis and Metagoninus sp. in the riverside area were 14.2% and 8.4%, respectively, which were significantly higher than those of the inland area (3.2% and 1.7%. respectively). The egg-positive rates of C. sinensis and Metagoninus sp. in males (16.7% and 10.0%) were significantly higher than those of females (3.5% and 1.8%) However, there were no significant differences of EPG values between localities and sexes. The prevalence of clonorchiasis and metagonimiasis in this survey was significantly lower than that in the previous reports. However. there is still a high prevalence of infection with C. sinensis and Metagoninus sp. in this region. especially in the riverside area.

• Parasites, Hosts and Diseases
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• v.56 no.4
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• pp.335-339
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• 2018

This study was conducted to investigate the prevalence of intestinal parasites among students from Goseonggun, Gangwon-do and Hadong-gun, Gyeongsangnam-do as typical low and high endemic counties. From May to July 2017, a total of 2,033 fecal samples were collected at 27 elementary, 10 junior high, and 8 high schools from 2 counties and examined by the Kato-Katz technique for egg-positive surveys (Collection rate: 37.02% [2,033/5,492]). Of the participants examined, 13 (0.64%) were found to harbor eggs of 3 parasitic species, Trichuris trichiura, Clonorchis sinensis and Metagonimus yokogawai. Based on the regional distribution, the egg-positive rate in Goseong-gun was 0% (0/550) and that in Hadong-gun was 0.88% (13/1,483). The positive rates for C. sinensis, M. yokogawai, and T. trichiura in Hadonggun were 0.20% (3/1,483), 0.61% (9/1,483), and 0.07% (1/1,483), respectively. The present survey showed that the prevalence of parasitic infection among students is currently very low even in remote, previously endemic areas, and the present status of parasitic diseases can be summarized as some transmission of fish/food-borne trematodes. Thus, it is necessary to carefully, continuously monitor the trematode infection status, particularly of C. sinensis and M. yokogawai.

• Journal of agricultural medicine and community health
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• v.15 no.2
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• pp.107-111
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• 1990

A survey was undertaken to evaluate the present status of intestinal infection in army soldiers. Stool specimen of 417 soldiers fixed by SAF solution were collected from a camp located in area of Nakdong river during the period from August to October of 1990. And these stool samples were examined by formalin-ether sedimentation technique once for helminths and protozoan cysts stained with Lugol's iodine solution. The results obtained in this survey were summarized as follows : l) The overall positive rate of intestinal parasite was 18.0%. 2) The egg positive rate of intestinal helminth was 15.1%, : and 11.5% for Clonorchis sinensis. 5.0% for Metagonimus vokogawai, 1.2% for Ascaris lumbricoides 1.7% for Trichiuris trichiura. 0.2% for Taenia sp. 3) The cyst positive rate of intestinal protozoa was 4.1% ; and 1.4% for Entamoeba coli, 1.9% for Giardia lamblia 0.7% for Entamoeba histolytica, 0.5% for Endolimax nana. 4) Most of samples were positive(85.3%) by single species. 10.7% by two species, 2.7% by three species and 1.3% by four species. 5) Infection rate of intestinal parasites among army soldiers decreased distinctly compared with previous data but it is revealed that the infection rate of Clonorchis sinensis among army soldiers in area of Nakdong river is still high in comparison with ever-reported data. 6) SAF fixatives used in this field survey during summertime was useful to conserve protozoan cyst and helminths ova. Also we could examine stool samples directly by formalin-ether sedimentation technique.

• Journal of agricultural medicine and community health
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• v.9 no.1
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• pp.67-73
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• 1984

Albendazole, a new broad spectrum anthelmintic drug, was evaluated for anthelmintic effects in 74 patients with single or mixed infections of Ascaris lumbricoides, Trichuris trichiura. Enterobius vermicularis, Metagonimus yokogawai, Clonorchis sinensis and Taenia spp. Albendazole was administered as a single dose of 400 mg. The cure rate for A. lumbricoides and E. vermicularis was 91.4% and 98.1% respectively at day 30 post-treatment: for T. trichiura it was 51.1% and for M. yakogawai and C. sinensis it was 33.3% and 13.3% respectively. The egg reduction rate at day 30 was 98.5% in A. lumbricoides, 76.5% for T. trichiura : 60.0% for M. yokogawai and 59.6% for C. sinensis However it was not cured in all 5 cases of taeniasis at three months follow-up examination. On the other hand, the various dosages of albendazole were given to the patients infected with C. sinensis and Taenia spp. respectively. The follow-up examinations were carried out at 30 days after treatment in clonorchiasis and at 3 months after treatment in taeniasis. In the results, the recommended dosage of albendazole for clonorchiasis is $3{\times}400mg$ for 3 consecutive days and for taeniasis $2{\times}400mg$ for 3 consecutive days. There were no side effects with the above dosages except only a mild abdominal pain and dizziness in a few patients. Albendazole appears to be more effective than the other available broad spectrum anthelmintic drugs.

• Parasites, Hosts and Diseases
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• v.22 no.2
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• pp.161-171
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• 1984

An epidemiological study on Metagenimus yokegawai infection was performed in Samcheok-Bun, Kangwon Province during the period from November 1983 to October 1984. Formalin-ether concentration technique and Stoll's dilution egg counting method were employed to figure out the prevalence and infection intensity of M. yrtkogawai infection. The results are summarized as follow: 1. The Prevalence of M. yokogawai infection was 13.3% among 1,172 examined; 18.0% (114 out of 632) in male and 7.8% (42 out of 540) in female. 2. The Prevalence rates were different by stream; 15.5% in Ohsip-chon (stream), 11.8% in Maeup-chon and 1.6% in Gagok-chon. 3. Along the basin of Oship-chon; 8.2% at the lower reaches in Samcheok-eup, 25.9% at the middle reaches in Miro-myon and 6.2% at the upper reaches in Dogeoe-eup, respectively. 4. By age group, the highest fate (18.3∼20.2%) was observed in 30∼49 years of age (male 24.1∼28.7%, female 11.2∼13.2%). 5. By social strata, the positive rate was 15.0% (120 out of 799) in general inhabitants and 9.7% (36 out of 373) in school children. 6. Intensity by EPG count in feces was 419 in average; the light infection (less than 400 EPG) was 70.4%, moderate infection (401∼1,000 EPG) 19.4% and heavy infection (more than 1,001 EPG) 10.25 respectively. 7. All the 67 sweetfish (length 10.3∼18.5cm) which were caught from Ohsip-stream were infected with metacercariae of M. yokogawai and the number of metacercariae detected were 382 per fish in average (323 in June and 382 in September). 8. Experiences of intake of raw fresh-water fish [Plecoglossus altivelis and Leuciscus (Tribolodon〕 were present in 50.3U (354 out of 704) of the inhabitants along Ohsip-stream according to questionnaire study. The results of this survey indicated that the middle reaches of Ohsip-stream in Miro-myon, Samcheok-gun is the endemic region for M. yokogawai infection.

• Parasites, Hosts and Diseases
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• v.32 no.3
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• pp.149-156
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• 1994

An epidemiological study fur the Intestinal trematode infection of the villagers was done In Koje-myon, Kochang-gun, Kyongsangnam-do, Korea in March, 1994. Of 116 stool specimens examined, total helmlnthic ova positive cases were 13 (11.2%) and cumulative ova positive cases 21 (18.1%): Echinostoma hortense 11 cases (9.5%), Metngonimus sp. 6 cases (5.2%), and Clonorchis sinensis 4 cases (3.4%). After the treatment and purgation, variable numbers of E. hokene, 6 to 227 per person, were collected from 7 echlnostome egg Positive cases, together with M. tokohoshii In 6 cases. Three adult flukes of E. cinetorchis were collected from one person and one Stellantchasmw jnlcatus was recovered from another case. This mountainous village was proved to be one of the endemic foci of echlnostomlasis In Korea.

• Parasites, Hosts and Diseases
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• v.57 no.3
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• pp.273-281
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• 2019

The infection status of digenetic trematode metacercariae (DTM) was investigated in fishes from 2 representative visiting sites of migratory birds in Gyeongsangnam-do, the Republic of Korea (Korea). A totaly 220 freshwater fishes (7 species) were collected from Junam-jeosuji (reservoir), and 127 fishes (7 species) were also collected from Woopo-neup (swamp) in June and October 2017. As the control group, total 312 fish (22 spp.) from Yangcheon in Sancheong-gun, Gyeongsangnam-do were also collected in June and October 2017. All fishes collected in 3 sites were examined with the artificial digestion method. In the fishes from Junam-jeosuji, more than 4 species, i.e., Clonorchis sinensis, Echinostoma spp., Diplostomum spp. and Cyathocotyle orientalis, of DTM were detected and their endemicy was very low, 0.70. More than 6 species, i.e., C. sinensis, Echinostoma spp., Metorchis orientalis, Clinostomum complanatum, Diplostomum spp. and C. orientalis, of DTM were found in the fishes from Woopo-neup, and their endemicy was low, 5.16. In the fishes from Yangcheon, more than 8 species, i.e., C. sinensis, Metagonimus spp., Centrocestus armatus, C. complanatum, C. orientalis, M. orientalis, Echinostoma spp., and Diplostomum spp., of DTM were detected, and their endemicity was relatively high, 95.48. The percentages of avian trematode metacercariae (ATM) were 99.6% and 94.7% in fishes from Junam-jeosuji and Woopo-neup whereas it was 74.1% in the control site, Yangcheon. The above findings suggested that migratory birds partly affect in endemicity of DTM in the fish in the 2 visiting sites in Gyeongsangnam-do, Korea.

• Parasites, Hosts and Diseases
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• v.59 no.1
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• pp.97-101
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• 2021

The infection status with Clonorchis sinensis metacercariae (CsMc) was examined in freshwater fishes from Yongjeon-cheon (a branch of Nakdong-gang) located in Cheongsong-gun, Gyeongsangbuk-do, the Republic of Korea (Korea). A total of 750 fishes in 19 species were examined by the artificial digestion method for 2 years (2019 and 2020). CsMc were detected in 378 (51.4%) out of 735 fishes in 14 species (73.7%), and the infection intensity was 666 per fish infected. In 2019, CsMc were found in 172 (68.0%) out of 253 fishes in 10 species, and the infection intensity was 565 per fish infected. In 2020, CsMc were detected in 206 (62.2%) out of 331 fishes in 10 species, and the infection intensity was 751 per fish infected. The other zoonotic trematode, ie. Metagonimus spp., Centrocestus armatus, Echinostoma spp. and Clinostomum complanatum, metacercariae were also detected in fishes from the survey streams, but their endemicities were relatively low. Conclusively, it was first confirmed that CsMc are highly endemic in fishes from Yongjeon-cheon in Cheongsong-gun, Gyeongsangbuk-do, Korea.