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KMID : 0383919670040000157
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Report of National Institute of Health
1967 Volume.4 No. 0 p.157 ~ p.159
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Epidemiological studies of Clonorchis sinensis in Korea (Ⅱ)
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Abstract
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An investigation was conducted in Koyang Gun, a low endemic area for clonorchiasis, for a period of a year from Sept. 1967.
Totally 1408 persons were interviewed with questionnaires of their customs and habits in raw fishi consumption and also tested for intradermal reaction for Clonorchis infection. Out of 1314 of them who had stool examination, 15.2% were found infected with Clonorchis. Out of a total of 736 school children (11-13 years old) taken from 5 scattered sample areas, 9.5% were positive with Clonorchis eggs. On the other hand, in the general population (all age groups included) taken from 5 scattered sample areas, 22.5% were positive out of 578 persons examinated. Sepcifically in school children in the areas near Han river, in infection rates were 15.1% out of 152 in Haengju, 12.1% out of 132 in Neunggok, and 18.1% out of 144 in Daewha. At Wondang, near the center of the Koyang Counry, 2.9% were found positive out of 139 examined. Onlay 0.6% were positive out of 169 examined at Naeyu, located in the northern most part of the County. The infection rates in the general population were haengju Ri 38.2% out of 102 examined, Samsungdang 32.6% out of 141, Daewha Ri 27.7% out of 112, Wonheung Ri (Wondang) 9.5% out of 105, and up north Naeyu Ri 3.4% out of 118.
Average EPml among school children were 1590 from 64 infected with the maximum 14000, and that of the general population were 4050 with the maximum 68300 from 109 examined.
In a reservoir host survey, the infection rates were 2.3% out of 84 hogs examined, 21.6% out of 51 dogs, and 3.8% out of 368 rats (Rattus norvegicus). Average number of worm burden per rat infected was 8.7 with the maximum 35. One cat examined was negative for Clonorchis eggs.
Distribution of the 1st intermediate host snail, parafossarulus manchouricus and its infection rates with Clonorchis cercariae were determined. The infection rates were from 0.7% to 6.9% with the average 3.1% out of a total of 2424 snails collected form 8 scattered sampling sopts in october 1967.
The density of the infection in fish sas examined by species and by localities. The highest infection was recorded with 31516 Clonorchis metacercariae form one Pseudorasbora parva collected from a pond in this area.
Together with other data, results of the investigations were analysed and discussed from the epidemiological point of view.
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