鈎虫と土質との関係並びに諸種薬物を混入した土壤の鈎虫卵発育に及ぼす影響について
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概要
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An examination of the stools collected from residents of the Yoro basin Ichihara-gun, Chiba Prefecture has revealed that the rate of carriers of ascarides and hookworms among them varied according to the differences in the soil: the rate of carriers of hookworms was higher in the community located in low land (Tsuiheji in Tokai Village) than in the adjoining community located on plateau (Yamadabashi in Ichihara Village), but the rate of carriers of ascarides was higher in the latter than in the former. With a view to ascertaining the reason for this fact, an investigation was carried out on the nature of the soil of both communities which has close relations with the development of hookworm ova. At the same time, experiments were conducted on the development of hookworm ova and the longevity of infected hookworm larvae cultured in the soil of both communities, and on the effects of drugs mixed in the soil on their development. Following are the results of the experiments: 1) The nature of the soil of both communities are entirely different(the low land is of alluvial soil and the plateau is of diluvial soil), but, when proper quantity of water was added no differences were recognized in the development of ova and the longevity of infective larvae. 2) For the development of hookworm ova, the optimum degree of moisture in the soil varied according to the nature of soil: which was approximately 28.0% and 44.0% in alluvial and diluvial soils, respectively. Ova developed into infective larvae when the degrees of moisture were 7.4%-36.6% in the former and 21.8%-57.9% in the latter. 3) The longevity of infective larvae in the soil was over 5 months at the optimum degree of moisture and over 2 months in rather dry conditions. However, in the presence of surplus of water, the majority of them perished in the first week, those survived living another 3 months. In each condition, the infective larvae of anchylostoma duodenale lived a little longer than those of necator americanus. 4) Differences in the rate of carriers of parasite worms among residents in both communities are attributable to the physical nature of the soil as well as the moisture in the soil. 5) Of various drugs, iodine drugs are the most powerful in killing ova and larvae, to which formalin and carbon disulfide ranks next. 6) It is possible to kill ova and larvae in the soil by the use of the same quantity of nitrolime as is usually used for fertilizer depending on the way in which it is used. 7) Ova and larvae of anchylostoma duodenale are more resistant to various drugs than those of necator americanus.
- 千葉大学の論文
- 1954-07-28