• Parasites, Hosts and Diseases
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• 제34권4호
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• pp.283-285
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• 1996

196년 9월 7일 전남 목표항에서 구입한 붕장어의 아가미 새엽에서 6개체의 피낭유충이 검출되었다. 이중 탈낭된 한 개의 형태를 관찰한 바 긴이형흡충의 피낭유충으로 동정되었으며, 붕장어가 긴이형흡층의 제2중간숙주 역활을 한다는 것으로 보고있다.

• Parasites, Hosts and Diseases
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• 제37권4호
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• pp.237-241
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• 1999

In order to analyze chromosome numbers and karyotypes of intestinal trematodes belonging to the genus, Metagonimus, the gonad tissues of M. takahashii, M. miyatai, and M. yokogawai were prepared and examined. The number of bivalents in the first meiotic division of M. takahashii was nine (n＝9). The diploid number of M. miyatai was observed to be eighteen (2n＝18) and their chromosomes consisted of one pair of metacentric, 7 pairs of submetacentric, and one pair of telocentric chromosomes. The diploid number of M. yokogawai was thirty-two (2n＝32) and the chromosome complements were composed of two pairs of metacentric, 11 pairs of submetacentric, and three pairs of subtelocentric chromosomes. These results could be a supporting evidence for the validity of the new species, M. miyatai, distinct from M. yokogawai.

• Parasites, Hosts and Diseases
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• 제52권3호
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• pp.291-294
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• 2014

Acanthotrema felis is an intestinal trematode of cats originally reported from the Republic of Korea. Only 1 human case infected with a single adult worm has been previously recorded. In the present study, we report 4 human cases infected with a total of 10 worms recovered after anthelmintic treatment and purging. All 4 patients reside in coastal areas of Jeollanam-do, Korea, and have consumed brackish water fish including the gobies, Acanthogobius flavimanus. The worms averaged 0.47 mm in length and 0.27 mm in width, and had 3 sclerites on the ventrogenital sac; 1 was short and thumb-like, another was long and blunt-ended, and the 3rd was long and broad-tipped. They were identified as A. felis Sohn, Han, & Chai, 2003. Surveys on coastal areas to detect further human cases infected with A. felis are required.

• Parasites, Hosts and Diseases
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• 제58권4호
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• pp.373-386
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• 2020

Fish-borne heterophyid trematodes are known to have a zoonotic potential, since at least 30 species are able to infect humans worldwide, with a global infection of around 7 million people. In this paper, a 'state-of-the-art' review of the South American heterophyid species is provided, including classical and molecular taxonomy, parasite ecology, host-parasite interaction studies and a list of species and their hosts. There is still a lack of information on human infections in South America with undetected or unreported infections probably due to the information shortage and little attention by physicians to these small intestinal flukes. Molecular tools for specific diagnoses of South American heterophyid species are still to be defined. Additional new sequences of Pygidiopsis macrostomum, Ascocotyle pindoramensis and Ascocotyle longa from Brazil are also provided.

• Parasites, Hosts and Diseases
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• 제59권6호
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• pp.645-649
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• 2021

Total 513 heterophyid flukes were collected from a carcass of wild Korean raccoon dog, Nyctereutes procyonoides koreensis, in Korea. With morphological and molecular characteristics, the flukes were identified to Cryptocotyle lata. The adult C. lata were minute, transparent, pentagonal, 522 ㎛ long by 425 ㎛ wide. Ceca extended into post-testicular region. Ventrogenital sac elliptical, 79 ㎛ by 87 ㎛ with genital pore and ventral sucker. Two testes semielliptical and slightly lobed, located in the posterior region, right testis 173 ㎛ by 155 ㎛, left testis 130 ㎛ by 134 ㎛. In a phylogenetic tree, the fluke specimen of this study was grouped with C. lata divergent from Cryptocotyle lingua. We report here N. procyonoides koreensis first as a natural definitive host of C. lata.

• Parasites, Hosts and Diseases
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• 제27권4호
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• pp.277-280
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• 1989

Stelldntthasntus falcatrts에 의한 인체감염 1례가 프라지콴텔 투여 후 충체를 수집함으로써 확진되었다. 환자는 서울에 거주하는 33세 남자로 복부 불쾌감과 공복통이 있다고 하였다. Formalin-ether 침전법으로 실시한 대변 검사에서 이형홉충류의 충란이 검출되어 프라지콴텔 600 mg을 1회 투여하고 1시간 후 황산 마그네슘 25 g으로 설사를 유도한 바 설사변에서 S. falcatus 17 마리와 H. nocens 14마리가 검출되었다. 치료 후 1개월에 실시한 대변검사에서는 충란이 검출되지 않았고 임상증상도 없어졌다고 하였다. 환자는 평소에 여러 종류의 생선회를 즐겨 먹었다고 하며 이들이 감염원일 것으로 추측된다. 이 중례는 S. felcatus의 국내 4번째 인체감염례에 해당된다.

• Parasites, Hosts and Diseases
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• 제55권1호
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• pp.31-37
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• 2017

This study aimed to investigate the morphology and reconstruct the phylogenetic relationships of Centrocestus formosanus originating from 5 species of freshwater fish, i.e., Esomus metallicus, Puntius brevis, Anabas testudineus, Parambassis siamensis, and Carassius auratus, in Chiang Mai province, Thailand. Sequence-related amplified polymorphism (SRAP) and phylogeny based on internal transcribed spacer 2 (ITS2) and mitochondrial cytochrome c oxidase subunit 1 (CO1) were performed. The results showed similar morphologies of adult C. formosanus from day 5 after infection in chicks. C. formosanus originated from 4 species of freshwater fish had the same number of circumoral spines on the oral sucker, except for those from C. auratus which revealed 34 circumoral spines. The phylogenetic tree obtained from SRAP profile and the combination of ITS2 and CO1 sequence showed similar results that were correlated with the number of circumoral spines in adult worms. Genetic variability of C. formosanus also occurred in different species of freshwater fish hosts. However, more details of adult worm morphologies and more sensitive genetic markers are needed to confirm the species validity of C. formosanus with 34 circumoral spines originating from C. auratus in the future.

• Parasites, Hosts and Diseases
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• 제55권1호
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• pp.47-54
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• 2017

The prevalence of cercarial infection in freshwater snails and their evolutionary trends were studied in Nakhon Nayok province, Thailand. A total of 2,869 individual snails were examined for parasitic infections. The results showed that 12 snail species were found to host larval stages of trematodes with an overall prevalence of 4.7%. The infected specimens included 7 types at the cercarial stage; cercariae, megalurous cercariae, echinostome cercariae, furcocercous cercariae, parapleurolophocercous cercariae, virgulate cercariae, and xiphidiocercariae. Regarding molecular identification, ITS2 sequence data of each larval trematode were analyzed, and a dendrogram was constructed using the neighbor-joining method with 10,000 replicates. The dendrogram was separated into 6 clades (order/family), including Echinostomatida/Echinostomatidae, Echinostomatida/Philophthalmidae, Opisthorchiida/Heterophyidae, Plagiorchiida/Prosthogonimidae, Plagiorchiida/Lecithodendriidae, and Strigeatida/Cyathocotylidae. These findings were used to confirm morphological characteristics and evolutionary trends of each type of cercariae discovered in Nakhon Nayok province. Furthermore, this investigation confirmed that the ITS2 data of cercariae could be used to study on phylogenetic relationships or to determine classification of this species at order and/or family level when possible.

• Parasites, Hosts and Diseases
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• 제26권1호
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• pp.65-68
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• 1988

경상남도 남해 지방산 숭어에서 Stellantchasmus falcatus의 길낭유충을 발견하고 횐쥐에 감염시킨 후 성충을 얻어 동정하였다. 검사한 숭어는 모두 10마리로서 크기 20~30cm이었고 그중 3마리에서 S. falcatus로 생각되는 퍼낭유충이 470개 검출되었다. 피낭유충은 원형 또는 타원형으로 크기 $0.15~0.20{\times}0.13~0.19mm$이었고 대부분이 숭어의 근육에서 발견되었다. 총 280개의 피낭유충을 횐쥐 5마리에 각각 30~100개씩 나누어 감염시키고 7~10일후에 흰쥐를 희생시켜 소장(소장) 내용물을 검경한 바 총 83마리의 성충이 회수되었다. 회수된 충체는 길이 0.41~0.70mm, 폭 0.32~0.39mm이었고, 장낭형(장낭형 ; elongated sac-like)의 expulsor를 가진 저정낭(seminal vesicle) 등 몇가지 형태학적 특징을 근거로 S. ialcatus Onji et Nishio, 1915로 동정되었다. 이 연구로 우리나라에서도 숭어가 S. falcatus의 제2중간숙주역할을 하고 있음이 확인되었고 이 홉충의 인체감염원이 되고 있을 것으로 추측되었다.

• Parasites, Hosts and Diseases
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• 제37권3호
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• pp.189-194
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• 1999

A case of human infection with Heterophyes nocens (Heterophyidae) was incidentally found in a biopsy specimen of the Meckel's diverticulum at the upper part of the small intestine. The patient was a 58-year-old man living in a rural area of Talsong-gun, Kyongsangbuk-do.He had gastrointestinal symptoms such as epigastric pain, indigestion, and abdominal discomfort for 3 months, and severe diarrhea, abdominal pain, and vomiting for about 1 month before hospitalization. Endoscopy of the upper part of the small intestine revealed a Meckel's diverticulum, and it was excised and histo-pathologically examined. Three adult flukes were incidentally found sectioned in the mucosa, and they were identified as H.nocens. The patient had a history of eating raw mullets at a fish market in Pusan 6 months ago, and the mullets were presumed to be the source of infection. This case brings a considerable interest in that specific diagnosis of heterophyid infections could be done by sectional morphology of the worms.