Infection status of Clonorchis sinensis in residents of Hamyang-gun, Gyeongsangnam-do, Korea

Kim, Bong Jin; Ock, Meesun; Kim, Ik Su; Yeo, Un Bo

doi:10.3347/kjp.2002.40.4.191

Cited by 14 publications

(14 citation statements)

References 5 publications

(5 reference statements)

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“…This decreasing phenomenon in senior groups may suggest the possibility of shorter life span of residents with clonorchiasis than that of uninfected ones at the endemic areas [10]. Our data updated recent status of clonorchiasis in endemic areas of Korea as reduced egg positive rate and lower intensity of infection compared with those of previous reports [4,9,11,12]. Whole and age-specific egg positive rates have decreased, and the age-specific peak moves to 60s from 40s or 50s.…”

Section: Discussionsupporting

confidence: 87%

Prevalence of Clonorchiasis in Southern Endemic Areas of Korea in 2006

Cho

Lee

et al. 2008

Korean J Parasitol

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Abstract:This study was performed to investigate prevalence of clonorchiasis among the inhabitants living in villages along the 4 major rivers, Nakdong-gang (= river), Seomjin-gang, Youngsan-gang, and Guem-gang in southern Korea. From January to December 2006, a total of 24,075 stool samples (1 sample per an inhabitant) were collected in 23 localities and examined by the formalin-ether sedimentation technique. Of the inhabitants examined, 3,441 (14.3%) were found to harbor various types of intestinal parasite eggs, cysts or larvae. Numbers of infected people were 2,661 (11.1%) for Clonorchis sinensis, 431 (1.8%) for heterophyids, 226 (0.9%) for Entamoeba spp., 57 (0.2%) for Giardia lamblia, 30 (0.1%) for Trichuris trichiura, and 18 (0.07%) for echinostomes. Prevalence rates of clonorchiasis according to the river basin were 17.1% in Nakdong-gang, 11.2% in Seomjin-gang, 5.5% in Youngsan-gang and 4.6% in Guem-gang. Of the 2,661 C. sinensis egg-positive cases, 57.7% was male. The present findings suggest that clonorchiasis is still highly prevalent among inhabitants in the riverside areas of southern Korea, and it is necessary to implement a systematic control program in the endemic areas.

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Section: Discussionsupporting

confidence: 87%

Prevalence of Clonorchiasis in Southern Endemic Areas of Korea in 2006

Cho

Lee

et al. 2008

Korean J Parasitol

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“…It is also useful to identify different species of trematodes using molecular methods. Kim et al (2002) and Rim (2005) reported many animal reservoir hosts of C. sinensis in Korea such as dogs, pigs, cats, rats, and wild mice. In this study, animal reservoir hosts of C. sinensis was not investigated.…”

Section: Discussionmentioning

confidence: 99%

Epidemiological study on Clonorchis sinensis infection in Shenzhen area of Zhujiang delta in China

et al. 2007

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To study the transmission route and epidemiological features of Clonorchis sinensis infection in Shenzhen area, which is the biggest immigration city in the south of China, we examined 1,473 individuals (710 males and 763 females) to assess the current status of C. sinensis infection among the people in a village of Shenzhen in Zhujiang delta of Guangdong province, China. Freshwater snails, 630, of different species known as the first intermediate host of C. sinensis were collected and examined for cercaria infection, and 430 freshwater fishes of different species as the second intermediate host were examined for metacercaria infection. Among 1,473 people examined, 70 (4.75%) were found infected with C. sinensis. By counting eggs per gram feces (EPG), it was found that the intensity of infection in males was stronger than that of females, and the average EPG was 41.87 in all population. Snails, 1.15%, were infected with cercariae of C. sinensis. The average infection rate of freshwater fishes of 15 species with metacercariae of C. sinensis was 16.97%, and the carps reached the highest infection rate (40.74%). A questionnaire was designed with 12 questions covering socioeconomic conditions and human behavior, contamination of the environment, and fishponds. Of 1,473 interviewees, 54% did not know about fluke disease or its transmission route, 12% of those who knew about the fluke believed that the infection causes no harm or only slight harm to their health. Of the interviewees, 27%, ate raw fish at least one to two times per month. Of families, 5% used the same utensils for both raw fish and cooked food. Of the fishpond owners, 40% fed their fishes with feces of domestic animals and humans. All these factors of unhealthy behaviors, poor knowledge, inappropriate farming/fishery practices, and eating raw fish have made the prevalence of clonorchiasis increase in humans in the Shenzhen area. It is urgent to perform a control program, including health education, environmental modification, reform of traditional farming/fishery practice, mass screening, and chemotherapy for humans, and the management of domestic animals to decrease C. sinensis infection in the human population in Shenzhen.

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“…Other studies also reported that C. sinensis infection was more commonly found in middle-aged individuals than in the elderly. 5,12,13 This suggests that, in endemic areas of Korea, the prevalence of C. sinensis infection is not declining in subsequent cohorts of adults despite extensive efforts that have been ongoing since the 1970s to discourage the consumption of raw freshwater fish and to identify and treat infected individuals. 12,14 A limitation of this study is the impossibility to quantify accurately the amount and frequency of raw freshwater fish intake.…”

Section: Discussionmentioning

confidence: 99%

“…5,12,13 This suggests that, in endemic areas of Korea, the prevalence of C. sinensis infection is not declining in subsequent cohorts of adults despite extensive efforts that have been ongoing since the 1970s to discourage the consumption of raw freshwater fish and to identify and treat infected individuals. 12,14 A limitation of this study is the impossibility to quantify accurately the amount and frequency of raw freshwater fish intake. However, hundreds of parasites can be harbored within a single fish, and most of the live metacercariae introduced into humans have a successful parasitic life.…”

Section: Discussionmentioning

confidence: 99%

Clonorchis Sinensis Infection and Increasing Risk of Cholangiocarcinoma in the Republic of Korea

Lim¹,

Ju²,

Franceschi³

et al. 2006

The American Journal of Tropical Medicine and Hygiene

135

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Abstract. To evaluate the prevalence and risk factors of Clonorchis sinensis infection, an epidemiologic survey was performed (3,169 residents; age range: 30-87 years; mean age ‫ס‬ 59; 1,973 women) in three areas with different mortality rates of cholangiocarcinoma. C. sinensis prevalence was 2.1% in Chuncheon, 7.8% in Chungju, and 31.3% in Haman, where cholangiocarcinoma incidence rate was 0.3, 1.8, and 5.5 per 100,000 persons, respectively. Of the four major risk factors for C. sinensis (male sex, alcohol consumption, raw freshwater fish intake, and area of residence), area was the strongest. Efforts to discourage raw freshwater fish intake, treat egg carriers, and protect water sources from C. sinensis contamination should be strengthened in the Republic of Korea.

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Infection status of Clonorchis sinensis in residents of Hamyang-gun, Gyeongsangnam-do, Korea

Cited by 14 publications

References 5 publications

Prevalence of Clonorchiasis in Southern Endemic Areas of Korea in 2006

Prevalence of Clonorchiasis in Southern Endemic Areas of Korea in 2006

Epidemiological study on Clonorchis sinensis infection in Shenzhen area of Zhujiang delta in China

Clonorchis Sinensis Infection and Increasing Risk of Cholangiocarcinoma in the Republic of Korea

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