湿度の鉤虫卵並びに仔虫の発育に及ぼす実験的研究

概要

論文の詳細を見る
An experimental study on the influence of the changes in humidity on the growth, hatching and longevity of the hookworm eggs, embryonic eggs and infective larvae of both the Necator americanus and Ancylostoma duodenale Dubini has been performed. These worms were exposed to varying degrees of humidity in a tank designed to keep a constant temperature of 30℃. The results of the study are summarized as follows: 1. The optimal humidity for the growth of eggs ranged from 100 to 95 %. The growth of eggs at comparatively early stages of development was markedly inhibited at a humidity of less than 90 %, and they died in a short period. 2. The growth of embryonic eggs was also markedly inhibited at a humidity of 90 %, and an exposure to this humidity for a short period resulted in a marked decline in the ability to be hatched. 3. As compared with eggs and embryonic eggs, infective larvae were rather resistant to a drop in humidity and were not easily affected by the dry air. Their resistance, however, varied according to the changes in the degree of humidity and the time of exposure; they could not survive a humidity of 40 % for over 10 hours. 4. It would seem that the eggs, embryonic eggs and infective larvae of the Ancylostoma duodenale Dubini are more resistant to changes in humidity than those of the Necator amer canus.
千葉大学の論文