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KMID : 0378019760190030283
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New Medical Journal
1976 Volume.19 No. 3 p.283 ~ p.294
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Epidemiological Studies on Clonorchiasis in the Area of Tam Jin River
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梁南吉/Yang, Nam Gil
羅昌洙/金昌世/정주현/文宰奎/鄭耀翰/Rha, Chang Su/Kim, Chang Se/Chung, Ju Hyun/Moon, Jae Kyu/Chung, Yo Han
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Abstract
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Clonorchiasis is the most important endemic disease in Korea, and it has been studied on the endemicity of clonorchiasis infection in Korea, relatively for a long time. As a result of efforts by the former authors it has been well known that some important and highly endemic foci of clonorchiasis were distributed in the middle and southern parts of Korea, chiefly in villages and towns along the main rivers such as Naktong, Yongsan, Mankyung and Han rivers. Although the endemicity of clonorchiasis has been studied on main rivers, as mentioned above, not untill now has any study been performed on the Tam Jin river. So, we have done research on this river.
From the 1st of April to the 30th of August, 1975, the epidemiological studies on clonorchiasis were carried out on the inhabitants, who live in the area of Tam Jin river. The intradermal test with VBS (veronal buffered saline) antigen was given to 2,981 inhabitants. The examination of the feces for eggs of C. sinensis was made by using the cellophane thick smear method: 2,105 inhabitants received this test. The degree of intensity of the clonorchiasis infection was estimated by the Stoll´s dilution egg counting technique. From the inhabitants, who reacted positively, 334 inhabitants were checked for the intensity of their infection.
The results obtained are as follows:
1. The positive rate of C. sinensis of the surveyed inhabitants was 34.6%(male: 42.1%, female: 24.6%) by the intradermal test.
2. The standard positive rate by the intradermal test of C. sinensis showed 35.5%(male: 39.9%, female: 26.3%).
3. The positive rate of P. westermani of surveyed inhabitants was 19.9%(male:21.2%, female: 18.2%), also by the intradermal test.
4. The positive rate of the surveyed inhabitants was 34.7% (male: 39.8%, female:25.9%) by the cellophane thick smear method.
5. The degree of intensity of clonorchiasis infection by EPG counts in the surveyed inhabitants indicated an average EPG count of 10,779 (male: 10,976 female:10,203). It was also found that as a person gets older the EPG count also increased.
6. The degree of intensity of clonorchasis infection showed light infection-21.0%, medium infection-39.8%, heavy infection-30.5%, very heavy infection-8.7%.
7. From 13 species of the fresh water fishes examined in this experiment, 7 species were found to contain metacercariae of C. sinensis. They are Pseudorasbora parva-86.7%, Carassius carassius35.0%, Pseudoperilampus uyekii-93.8%, Xcoco platypus-33.3%, Gnathopogon majimae-62.5%, Gnathopogon coreanus-60.0%, Pseudogobio esocinus-20.0%. The six which were unobtainable are Channa
argus, Parasilurus asotus, Misgurnus anguillic audatus, Cyprimus carpio, Liobagrus mediodiposalis and plecoglossus altivelis.
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