Background: Diseases due to parasites transmitted through food, including liver fluke and intestinal fluke a dangerous disease groups for people.\r\n', u'Objectives: to evaluate trematode infection situation in epidemic areas before providing drug to treat massively high-risk subjects.\r\n', u'Subjects and methods: A cross-sectional study was carried out in two communes of Nghia Hung district, Nam Dinh province to determine the trematode infection in human in August 2007. Families were randomly selected, and all of members of households were examined for trematode eggs by Kato-Katz technique. A total of 578 people, comprising 321 males (55.5%) and 257 females (44.5%) underwent stool examination. T\r\n', u'Results:120 (37.4%) males and 66 (25.7%) females were positive for small trematode eggs. There was a significant difference between males and females for infection rates with small trematode (X2 = 8.43; p < 0.05). The infection rate of trematodes was lowest in \u2264 20 age group and highest in >60 years old among both males and females. In the majority of the patients with small trematode eggs, the infection intensity was low: about 90.3% whereas 9.7% had moderate infection intensity. High intensity rate (>10.000 epg) was not found. \r\n', u'Conclusion: Trematode infection situation through food is still a healthy problem at investigated epidemic areas. \r\n', u'
Trematode infection ;

Human sparganosis in Korea was discussed on the bases of five human cases experienced by the present authors and 58 case records already reported by many previous authors, in aspects of epidemiology and clinical features. Sparganosis is not infrequent tissue helminthiasis now in Korea and the incidence has been evidently increased during past 10 years. It might be interpreted that improved medical delivery system and health care exposed the hidden but prevalent disease. The distribution of sparganosis in Korea is apparently subdivided into three major endemic areas; Kyunggi Do, Kyungsang Do and Hamkyung Nam Do. Although scanty in other areas of Korea, the distribution of this disease is presumably throughout the whole peninsula of Korea except Cheju Do. The majority of human cases of sparganosis in Korea has revealed raw consuming of snakes for treatment of tuberculosis, syphilis and joint pain, for tonics and for the belief of special nutrition among very limited group of Korean population. Because of this kinds of mode of infection, comprising four fifths of all cases, the majority of cases detected were male adult consisting of about 70% of total cases. And drinking of untreated water in rural area where no protective, sanitary measures for water sources were provided in the past, seems another important causes of infection especially in women and children in Korea. Thus it may be concluded that sparganosis in Korea is concluded by eating of infective stages per os voluntarily or involuntarily, but not through the direct invasion. Clinically, subcutaneous mass or lump was the most frequent problem in those patients and those masses were associated with inflammatory signs. By the anatomical location of the lesion, some peculiar manifestations could be developed as in orbital, abdominal, urethral, ureteral and vertebral cases. And the lesions could be complicated by haemorrhage or abscess formations. The larval worms hitherto collected in Korea has been identified tentatively as Sparganum mansoni because neither branched larvae nor Sparganum proliferum were ever reported.
parasitology-helminth-trematode ; Spirometra sp. ; sparganum ; case reoprt ; epidemiology

This study was performed to observe the infection status of sweetfish, caught from Kwangjung-stream and Namdae-stream in Yangyang-gun, Kangwon-do in August 1989, with the metacercariae of Metagonimus yokogawai. All of 28 sweetfish from Kwangjung-stream were infected with the metacercariae of M. yokogawai. The number of metacercariae in a fish ranged 89-521(224 on average), and the number of larvae/g of flesh was 12 approximately 55 (22 on average). On the other hand, no metacercariae were detected in the fish from Namdae-stream. It has been confirmed that the Kwangjung-stream in Yangyang-gun, Kangwon-do is one of the endemic foci of metagonimiasis in Korea.
English-Abstract ; Fish-Diseases-parasitology ; Heterophyidae-isolation-and-purification ; Korea-epidemiology ; Trematode-Infections-parasitology ; *Fish-Diseases-epidemiology ; *Fresh-Water ; *Heterophyidae- ; *Trematode-Infections-epidemiology

This study was performed to observe the infection status of sweetfish, caught from Kwangjung-stream and Namdae-stream in Yangyang-gun, Kangwon-do in August 1989, with the metacercariae of Metagonimus yokogawai. All of 28 sweetfish from Kwangjung-stream were infected with the metacercariae of M. yokogawai. The number of metacercariae in a fish ranged 89-521(224 on average), and the number of larvae/g of flesh was 12 approximately 55 (22 on average). On the other hand, no metacercariae were detected in the fish from Namdae-stream. It has been confirmed that the Kwangjung-stream in Yangyang-gun, Kangwon-do is one of the endemic foci of metagonimiasis in Korea.
English-Abstract ; Fish-Diseases-parasitology ; Heterophyidae-isolation-and-purification ; Korea-epidemiology ; Trematode-Infections-parasitology ; *Fish-Diseases-epidemiology ; *Fresh-Water ; *Heterophyidae- ; *Trematode-Infections-epidemiology

Microphallus species occur primarily as intestinal parasites of birds and mammals, and metacercariae of a new species belonging to this genus have been discovered from the crab, Macrophthalmus dilatatus, in the Republic of Korea. The metacercaria of this fluke was round with 2 thick walls, and the excysted one had mature genital organs. The adult flukes recovered from experimentally infected chicks had numerous intrauterine eggs, well-developed pars prostatica, widely bifurcating ceca, and prominent uterine bulge. After observing internal structures, it was concluded that this species is different from any other known Microphallus spp. Based on the morphology of metacercariae and adult flukes, we describe this specimen as a new species, Microphallus koreana n. sp.
Animals ; Brachyura/*parasitology ; Chickens ; Rats ; Trematoda/*anatomy & histology/*classification/isolation & purification ; Trematode Infections/parasitology/transmission

Author studied on the incidence of intestinal parasites with fecal examination on the out patient Pusan University Hospital, between from January to December 1969. The method employed were Formalin-Ether and flotation method in 3,510 for the prevalence rate of intestinal helminthes(Ascaris lumbricoides, hookworm, Trichocephalus trichiurus, Trichostrongylus orientalis). The following results were obtained: The positive rate of intestinal helminthes of total was 65.4 percent among 3,510 persons. The infection rate of Ascaris lumbricoides, hookworm, Trichocephalus trichiurus, Trichostrongylus orientalis were 19.3 %, 6.5 %, 55.2 % and 46.1 %. The female (66.4%) had definitely higher infection rate than male (65.0 %). The age group of 51-60 year of the male showed highest infection rate 75.4 % and the age group 31-40 year of the female showed highest infection rate 72.9 %.
parasitology-epidemiology-helminth ; nematode ; trematode ; Ascaris lumbricoides ; hookworm ; Trichocephalus trichiurus ; Trichostrongylus orientalis

Ever since the first intermediate host of Clonorchis sinensis was identified with Bulimus striatulus, it has been place to an important position in epidemics. One way to prevent Clonorchis sinensis is to exterminate Bulimus, which is itself the first intermediate host and there by to separate the life cycle of Clonorchis. In killing B. striatulus, nicotine sulfate and lindane have been chosen from insecticides which are widely used in farming areas. And then nicotine sulfate and lindane have been used to check their effectiveness in killing B. striatulus. In this experiment, the resistance of cercaria which parasites to B. striatulus has also been studied. Dipping method was used in the study. Nicotine sulfate and lindane have been used to check the mortality effect. Nicotine sulfate was used to check percentage of mortality in varied times. The existance of cercaria was tried only in nicotine sulfate. In the experiment of mortality effect of insecticides to B. striatulus and cercaria, the difference in killing rate and the resistance in different concentration and different length of time have been researched. It resulted as following: In the experiment with nicotine sulfate, the mortality increased with thicker concentration in the constant length of time. When compared the necessary liquid of nicotine sulfate and lindane in LD 50, nicotine sulfate was less used than lindane, but the mortality proved high. In the treatment to the same concentration of nicotine sulfate in different length of time, it proved that the longer period showed higher mortality. The mortality time required in LD 90 of nicotine sulfate was dependent on the concentration. And thicker concentration showed quicker effect. In the resistance of cercaria and B. striatulus to nicotine sulfate, the resistance of cercaria was proved to be stronger than that of B. striatulus.
parasitology-chemotherapy-helminth-trematode-Clonorchis sinensis ; Bulimus striatulus ; nicotine sulfate ; lindane

Mathematical models such as the negative binomial, Poisson and Polya-Eggenberger distributions were applied to the observed data of the number of metacercariae of Paragonimus iloktsuenensis in crab hosts, Sesarma dehaani which were collected in Hadong, South Kyong-sang Do, Korea. From the above analysis, it was found that the pattern of density of metacercariae of this lungfluke among the crab hosts was well fitted to the negative binomial distribution, rather than to the Poisson or Polya-Eggenberger distribution.
parasitology-helminth-trematode ; Paragonimus iloktsuenensis ; epidemiology ; mathematics ; metacercaria ; crab ; Sesarma dehaani

In order to determine the current infection status of pond smelts, Hypomesus olidus, and other freshwater fishes with trematode metacercariae, a total of 4,861 pond smelts and 18 other freshwater fishes, collected from the Soyang and Uiam Lakes in Gangwon-do, the Unam Lake in Jeollabuk-do, the Jangseong Lake in Jeollanam-do, the Uirim-ji (lake) in Chungcheongbuk-do, and the Andong Lake in Gyeongsangbuk-do, were individually digested with 1% pepsin-HCl and examined under a dissecting microscope. In all pond smelts caught from the 6 lakes, we were unable to detect any known human infectious trematode metacercariae in Korea. However, in other freshwater fishes, such as, Squalidus japonicus coreanus (Unam Lake), and Zacco platypus (Jangseong Lake) and Opsariichthys uncirostris amurensis (Jangseong Lake), metacercariae of human-infecting trematodes, i.e., Clonorchis sinensis and Metagonimus sp. were detected, respectively.
Trematode Infections/*veterinary ; Osmeriformes/*parasitology ; Korea ; Humans ; Fresh Water ; Fish Diseases/*parasitology ; Animals

Eosinophilic gastroenteritis is a rare disorder, characterized by increased eosinophil count and eosinophilic infiltration in gastrointestinal organ. Its etiology is unknown, but affected by parasitic infestation, collagen disorder, malignancy and allergic disorder. There have been several reports all over the world that Eustoma rotundum, Schistosomiasis, Ancylomastoma and Ascaris are the sources of parasites occurring eosinophilic gastroenteritis. But the reports on Metagonimus yokogawai have not presented yet. We experienced a case of metagonimiasis with a presentation of small bowel perforation by eosinophilic enteritis. A 35-year-old woman was admitted to the hospital because of epigastric pain. Six months ago, she had been treated as metagonimiasis. This time she took antiparasitic agent again, but abdominal pain was aggravated and perforation of small bowel was detected. The pathologic finding of resected small bowel showed perforation and obstruction with diffuse and dense eosinophilic infiltration.
Abdominal Pain ; Adult ; Ascaris ; Collagen ; Enteritis ; Eosinophils* ; Female ; Gastroenteritis* ; Heterophyidae ; Humans ; Parasites ; Schistosomiasis ; Trematode Infections*