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KMID : 0383919720090000303
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Report of National Institute of Health
1972 Volume.9 No. 0 p.303 ~ p.326
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Studies on control of intestinal parasites in Korea
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ÑÑÔÔó¾/Kim, Dong Chan
ì°è®çµ/ùÛëùïá/õËܼüº/ÑÑ÷Áê©/άòåà÷/õËê¹çµ/Lee, On Young/Han, Eui Jung/Choi, Byung Hwan/Kim, Tae Woong/Kwak, Jin Sung/Choi, Won Yong
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Abstract
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This study was conducted to assess the effects of periodic mass treatment for the control of ascariasis and hookworm infection in rural area of Korea. An additional study was alaso conducted with the ultimated goal of environmental treatment on the ovicidal agents of Ascaris eggs. This report constitutes the third year of the study conducted in Koyang-gun, Kyunggi-do, since 1970.
1. From a total of 1,550 persons examined in the first survey in sping 1972 both by the cellophane thick smear technique and the saturated brine floatation technique, the helminth prevalence rate reached 87.9% - by species, Ascaris lumbricoides 67.1%, Trichuris trichiura 58.1%, hookworm 3.9%, Trichostrongylus orientalis 6.9%, Hymenolepis nana 0.06%. In comparing the prevalences between school and village groups, those whih Ascaris Lumbricoides, hookworm, and Trichostrongylus orientalis (66.3%, 2.6%, and 6.3% respectively) in schoolchildren were lower than those (Ascaris 70.9%, hookworm 10.1%, Trichostrongylus 9.7%) of the general village Populations. Such Prevalences of infections were considered to have resulted from mass treatment conducted against those parasites in the past two years and show that better results could be obtained in schoolchildren than in the village groups.
2. From the data obtained so far, mass treatment against ascarlasis conducted once a year is not sufficient for the redction of the prevalence rate in rural areas under present conditions. Slow but steady reduction of the prevalence could be achieved when the mass treatment is thoroughly conducted regularly twice a year, and this procdure was thought to be reasonable under present condittons in Korea. Mass treatment conducted three times a year has revealed a better reduction rate in the prevalence of the infection.
3. Piperazine adipate was effective In reducing the prevalence when more than two doses were administered per treatment, and two doses of Piperazine treatment was considered reasonable. Colzumin haa been used with satisfactory egg negative conversion rate.
4. A better egg negative conversion rate was obtained when the treatment was conducted directly with each person by project workers than in the case of indirect treatment through a third person.
5. In general mass treatment against ascariasis, blanket mass treatment was considered to be more efficient than the conventional case finding - treatment procedure for those communities which has a prevalence rate over 50 percent.
6. In hookworm infection, better results were seen in the reduction rate than in ascariasis. A similar tendency was also seen in Trichostrongylus infection. In village groups, however, such reuslts could be expected only when the case finding-treatment procedures were conducted thoroughly. Anthelminthic effects of Alcopar against hookworm infection has been stisfactory.
7. In a study on ovicides for Ascaris eggs, sodium nitrite combined with monocalcium phosphate revealed satisfactory ovicidal effects. Thiabendazole showed stronger effects than the sodium nitrite-monocalcium phosphate system. However, such strong ovicidal effects with thiabendazole were completely ineffective when combined with monocalcium phosphate which is used as chemical fertilizer. Thiabendazole has not revealed any retarding or harmful effects on the growth of vegetables.
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