鉤虫と蛔虫との拮抗現象に関する実験的研究 : 第1編 鉤虫保有諸メジウム中に於ける豚蛔虫の飼育実験

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概要

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• Hook worm infection is prevalent among the townsmen of Goi in Chiba Prefecture - the carriers of hook worm eggs form from 35 % to 70 % of the whole population. But the number of those who carry Ascaris eggs is rather small, accounting for from 10 % to 35 % of the population. As has previously been pointed out by Prof. Tanikawa, the prevalence of hook worm infection in this area would be attributed to the characteristic method of farming as well as to the low and humid topography. However, no views have ever been advanced as to the reason why the rate of carriers of Ascaris is low. As there exist no differences between the people of this area and those of othse farming villages in the mode of living, especially the method of disposal of the night soil, the author postulated that the antagonistic effect of hook worms on Ascaris might be responsible. In order to prove this antogonistic effect experimentally, the author carried out in vitro experiments on the breeding of A. suilia in various mediums that are assumed to contain secretions and exudations by hook worms. The life spans of A. suilia bred in the solutions of the stools of men and dogs of high hook worm infection, the concentrated fluid mediums for breeding hook worm larvae and the emulsion of canine hook worms, were compared with those of the control. The results are summarized as follows: 1) The life spans of A. suilia bred in the solutions of the stools of men and dogs of high hook worm infection were slightly shorter than those of the control bred in the solutions of stools entirely free of hook worms. 1) The life spans of A. suilia bred in the solutions of the stools containing Necator were slightly shorter than those bred in the solutions of stools containing Ancylostorna. 3) The life spans of A. suilia bred in the emulsions of canine hook worms were more or less shorter than those of the control. From the results of the experiments described above, it would seem that the mediums containing hook worms have inhibitory effect, though of slight degree, on the growth of Ascaris. It would, however, be a jumping logic to assume that the high infection of hook worms in the intestines of animals might be antagonistic to the infection and survival of Ascaris. Further experiments in animals would be required in order to prove this theory.

• 千葉大学の論文

著者

• 山脇 知

  千葉大学医学部衛生学教室

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• 鉤虫と蛔虫との拮抗現象に関する実験的研究 : 第1編 鉤虫保有諸メジウム中に於ける豚蛔虫の飼育実験
• 鉤虫と蛔虫との拮抗現象に関する実験的研究 : 第2編 鉤虫の寄生犬に対する蛔虫の感染実験
• 鉤虫と蛔虫との拮抗現象に関する実験的研究-1・2-

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