• Korean Journal of Clinical Laboratory Science
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• v.39 no.2
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• pp.86-90
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• 2007

Intestinal parasitic infections remain a serious public health problem globally and have usually been associated with human malnutrition. This study was performed to observe the present status of intestinal helminthes infections among the primary school children in Iksan, Korea, during the period from June to August, 2006. A total of 974 fecal samples (male 479, female 495) were collected and examined by formalin-ether sedimentation technique for intestinal helminthes eggs. Of the 974 samples examined, 2 (0.2%) were egg positive for intestinal helminthes, and only eggs of Clonorchis sinensis were observed in the 2 cases. These C. sinensis egg were found in grade 5 (male, 1 case) and grade 6 (female, 1 case), respectively. The egg positive rate of male and female were 0.2%, respectively. Through this survey, I found that the C. sinensis infection is prevalent among primary school children in Iksan, Jeonbuk, and a continuous health education for school children is recommended to prevent the potential infection of C. sinensis.

• Parasites, Hosts and Diseases
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• v.38 no.4
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• pp.275-277
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• 2000

The status of intestinal parasite infections was investigated in two rural villages (Chitrasar, Jerona) in Chitwan District, Nepal in 1999. Stool examination was performed with a total of 300 specimens from schoolchildren by formalin-ether sedinentation technique. The prevalence rate of intestinal parasite infections in the surveyed areas was 44.0%. The prevalence rate in Jerona was slightly higher than that in Chitrasar. The prevalence rate of intestinal parasite infections in female was slighly higher than that in male without statistically significant difference. Entamoeba coli was the most commonly found protozoan parasite (21.0%) followed by Giardia lamblia (13.7%) and others (5.3%). Hookworm was the most prevalent intestinal helminth (13.0%) followed by Trichuris trichiura (3.0%) and others (5.0%). forty-three specimens (14.3%) Showed mixed infections. It is necessary to implement large-scale treatment with anthelminthics, health education and sanitary improvement for intestinal parasite control in the surveyed areas.

• 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.

• Parasites, Hosts and Diseases
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• v.28 no.1
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• pp.63-67
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• 1990

This study was performed to evaluate the status of intestinal parasitic infections among the inhabitants in two islands (Chu-do and Doomi-do) of Tongyeong.gun, Kyeongsangnam-do (Province), from August to September, 1989. A total of 189 stool specimens was collected from the inhabitants of 3 villages and examined by Kato's cellophane thick smear and formalin.ether sedimentation techniques. Stoll's dilution egg counting technique was done for the quantitative examination of helminth eggs. The overall Positive rate of intestinal Parasites was 30.2%. The egg Positive rate of Ascaris lumbricoides was 2.1%, that of Trichuris trichiura 24.3%, hookworm 2.1%, Trichostrongylus orientazis 0.5%, Czonorchis sinensis 1.1%, heterophyid 1.6%, and Taenia species 2.6%. The cyst positive rate of Giardia lamblia was 1.6% and that of Entamoeba soli 0.5%. In T. trichiura infection, the egg Positive rate of females (29.9%) was much higher than that of males (17.2%). Among the age groups, 10~19 year group showed the highest inflection rate, 32.4%. It was revealed that the prevalence of intestinal parasitic infections among the inhabitants of remote islands should be still high in comparison with ever-reported ones in urban or rural areas.

• Parasites, Hosts and Diseases
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• v.24 no.2
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• pp.209-212
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• 1986

The present study was undertaken to evaluate the present status of intestinal parasitic infection in Seoul area, Korea. During the period from June 1985 to July 1986, a total of 5,251 stool samples were collected in Department of Clinical Pathology, Hanyang University Hospital and examined by formalin-ether sedimentation technique once for helminth ova and protozoan cysts. The results were summarized as follows: 1. The overall egg positive rate of intestinal helminthes was 2.53%; and 1.43% for Clonorchis sinensis, 0.7% for Trichuris trichiura, 0.13% for Metagonimus yokogawai, 0.06% for hookworm, and 0.02% for Ascaris lumbricoides, Diphyllobothrium latum and Hymenolepis nana, respectively. 2. The overall cyst positive rate of intestinal protozoa was 1.07%. Cyst positive rate was 0.06% for Entamoeba histolytica and 0.13% for Giardia lamblia, respectively. 3. Higher prevalence of intestinal parasitic infection was observed in male and in $21{\sim}50$ year-old groups. 4. The highest prevalence of Clonorchis sinensis infection was observed in 40th age group (3.4%), and male (2.3%) was more infected than female (0.7%) in general.

• Biomedical Science Letters
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• v.2 no.2
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• pp.267-274
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• 1996

This study was performed to observe the present status of intestinal parasitic infections among the children in Iksan, Jeonbuk, Korea. During the period from February to June 1996, total 510 fecal samples(male 276, female 234) were collected and examined by formalin-ether sedimentation technique and trichrome stain for intestinal helminths and protozoan cysts. Of 510 samples examined, 62(12.2%) were positive for intestinal parasites. Helminth egg positives were 3(0.6%), and protozoan cyst positives were 59(11.6%). The female group showed higher positive rate(13.2%) than males(11.2%), and the highest positive rates were observed in 7 age group(17.5%), and lowest positive rates were 4 age group(9.5%). 3 species of helminths egg and 6 species of protozoan cyst were detected; Metagonimus yokogawai 0.4%, Enterobius vermicularis 0.2%, Trichuris trichiura 0.2%, Endolimax nana 4.1%, Entamoeba coli 3.9%, Ciardia lamblia 2.0%, Entamoeba histolytica 1.4%, Iodamoeba butschilii 0.8%, and Chilomastix mesnili 0.4%, respectively. In 3 helminth egg positive cases, single infection was 2(66.7%), and double infection 1(33.3%), among 59 protozoan cyst positives, single infection was 54(91.5%), and double infection was 5(8.5%). The highest positive rate of protozoan cyst was 7 age group(14.3), and lowest positive rate was 4 age group(9.5%).

• Parasites, Hosts and Diseases
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• v.26 no.4
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• pp.275-284
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• 1988

This study was performed to observe the present status of intestinal parasitic infections in a remote island, Yondo, located in southern part of Jeonranam-do (Province) , Korea. In February and May, 1988, total 1,011 individual stool samples were collected and examined for intestinal helminths and protozoa using formalin-ether centrifugal sedimentation technique. The results are summarized as follows: 1. Of 1,011 inhabitants examined, 398(39.4%) were positive for intestinal parasites. Helminth positives were 372(36.8%) , and protozoan cyst positives were 56(5.5%) . 2. Ten species of parasites were found. Trichuris trichiura revealed the highest infection rate of 27.5%, Ascaris lumbricoides 17.4%, Taenia sp. 5.8%, Entamoeba coli 3.3%, Ciardia Zamblia 1.5%, Endelimax nasa 0.8%, Hymenolepis nana 0.4%, Hookworm 0.2%, Trichostrongylus orientalis 0,2%, and Entamoeba histolytica 0.2%, respectively. 3. The female group showed higher positive rate(44.0%) than males (34.7%). Also, higher positive rates were observed among adults as compared with the group younger than 10 years old. 4. Average value of E.P.G. was 1,876(range 200∼17,800) in A. lumbricoides positives, and 327 (range 200∼1,600) in T. trichiura positive cases. 5. In helminth egg Positive cases, single in(traction was 63.4%, double infection 34.7%, and triple infection 1.9%, respectively. Among protozoan cyst positives, single infection was 94.6%, and double infection was 5.4%. The present study revealed that the prevalence of intestinal parasites among inhabitants in Yondo island is still so high that special control measures should be performed.

• 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.42 no.4
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• pp.201-203
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• 2004

A survey was conducted to determine the extent of intestinal parasite infection in Bat Dambang, Cambodia in March 2004. A total of 623 fecal specimens was collected from kindergarten and schoolchildren and examined using the formalin-ether sedimentation technique. The overall infection rate of intestinal parasites was 25.7% (boys, 26.2%; girls, 25.1%), and the infection rates of intestinal helminthes by species were as follows: Echinostoma sp. 4.8%, hookworm 3.4%, Hymenolepis nana 1.3%, and Rhabditis sp. 1.3%. The infection rates of intestinal protozoa were; Entamoeba coli 4.8%, Giardia lamblia 2.9%, Iodamoeba butschlii 1.4%, Entamoeba polecki 1.1 %, and Entamoeba histolytica 0.8%. There were no egg positive cases of Ascaris lumbricoides or Trichuris trichiura. All children infected were treated with albendazole, praziquantel, or metronidazole according to parasite species. The results showed that intestinal parasites are highly endemic in Bat Dambang, Cambodia.

• Parasites, Hosts and Diseases
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• v.54 no.2
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• pp.215-219
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• 2016

Clonorchis sinensis is currently the most important parasite affecting public health problems in the Republic of Korea. We investigated the prevalence of C. sinensis infection among residents living along 5 major rivers in Korea. A total of 42,562 individual stool samples were collected from 37 localities and examined using the formalin-ether sedimentation technique. Helminth eggs were detected in 4,052 (9.5%) residents and 3,586 (8.4%) were infected with C. sinensis. The egg positive rate of C. sinensis in Nakdong, Seomjin, Geum, Yeongsan, and Han River was 11.7%, 9.9%, 6.5%, 3.1%, and 1.0%, respectively. The overall prevalence of clonorchiasis by sex was 11.2% in males and 6.2% in females. The age-prevalence was the highest in the 50-59 years band. It has been reconfirmed that the endemicity of clonorchiasis is higher in southern areas of Korea, especially along Nakdong and Seomjin Rivers. A combination of continuous control programs with health education initiatives is urgently required in these highly endemic areas of clonorchiasis in Korea.