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KMID : 0383919750120000095
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Report of National Institute of Health
1975 Volume.12 No. 0 p.95 ~ p.102
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Studies on the ovicides against parasites eggs
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金東燦/Kim, Dong Chan
李溫永/韓義正/崔秉煥/金南洙/Lee, On Young/Han, Eui Jung/Choi, Byung Hwan/Kim, Nam Soo
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Abstract
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As preventive measure of intestinal parasites transmission, environmental improvement to block the route of contamination of the parasite products is essentiat along with the mass treatment. A study was conducted to assess the value of thiabendazole as ovicide against Ascris eggs and the proper method of application from the practical point of view. The effect of the chemical was tested on the eggs in nightsoil and in soil as well as in water under the different temperature conditions, and the following results were obtained.
1,´The ovicidal action of thiabendazole in water was very strong at 25℃ and the eggs were completely destroyed at 3.12 ppm within 3 or 7 days of exdosure. The effect was consierably reduced at lower temperatures, 15℃ and further 5℃, comparing with the result obtained at 25 ℃.
2. In nightsoil, the minimum concentration of thiabendazole required to destory Ascaris eggs completely at 25℃ was 3.12 ppm in both 3 and 7 days of exposure as in water, 6.25ppm in 7 days and 12.5 ppm in 3 days at 15℃, and 25ppm in 7 days and 50 ppm in 3 days at 5℃. Thus the concentration was increased by a step of double strength by shorting the days of exposure 7 to 3 and again lowering the temperature by 10℃ to 5℃.
3. In soil, the ovicidal action was remarkably reduced at 25℃, showing the minimum effective concentration in 7 days 12.5-50 ppm depending on the samples tested. At lower temperatures, however, 15℃ and 5℃, only a little fluctuation was seen in the minimum effective concentration level during the 7 days of exposure. Thus thiabendazole was found unsuitable for applying on soil.
4. It was discussed that thiabendazole could be regularly applied to night soil tanks of conventional toilet of village houses a few times a year preferally in warmer seasons during the first one or two years of mass treatment at least in selected villages, if not all with reasonable expense for them from the cost-benefit point of view.
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