犬蛔虫自然感染,特に先天感染と生後感染との比較
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概要
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One hundred and sixty-three dogs, from five days to six years of age, were examined for the occurrence of ascarid, Toxocara canis, and the comparison of the body size was performed between these worms and the prenatally infecting worms. 1) Very high occurrences are found in dogs under four months of age, but markedly decrease as grow older, resulting in very low occurrence in dogs over two years of age. However, three of four bitches examined from ten to forty-six days postparturition harbored the worms which were assumed as derived from the postnatal infection. 2) The spontaneous elimination of the prenatally infecting worms appear to begin about one months after birth, but some of them may remain in the host and continue to grow until about fifty to sixty days after birth. 3) The postnatal infection seems to occur until four months after birth. 4) The occurrence of the postnatal infection is rather low under natural conditions, occurring in sixteen of forty-two dogs under four months of age, and in addition, the number of the worms in individual dogs is usually in low level, calculating from one to six in numbers in the majority of positive cases. 5) In dogs over thirty days of age a few worms are difficult to be determined whether infecting prenatally or postnatally. 6) The larvae which pass through the trachea and esophagus may remain and grow in the stomach for some times, and then pass to the small intestine. In addition, the spontaneous elimination of these larvae in feces may occur. 7) The prenatally infecting worms begin to pass eggs in feces from twenty-one to twenty-seven days after birth, but in most cases from twenty-one to twenty-three days.
- 大阪府立大学の論文
- 1957-01-25