鉤虫Carrierの研究 : 第I編 五井保健所に於ける鉤虫症患者の受診状況,及び管内三部落の鉤虫感染状況
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概要
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Studies made on cases of ancylostomiasis among the outpatients of Goi Health Center for the years 1953 and 1954 revealed the following results : (1) Of 1,651 patients seen at the outpatients' consulting room of Goi Health Center, 284 patients, or 17.2 per cent, were found to be affected with ancylostomiasis. There was a significant difference between men and women in the incidence of ancylostomiasis, it being higher among women than among men. It seems imperative that a health center, which is the institution officially responsible for public health, should work out a program for organization of anti-parasite worm campaigns in the rural district. (2) The incidence of ancylostomiasis tended to be high in areas where hookworm infections as investigated by Kawamoto were high. (3) The curve representing the monthly occurrences of ancylostomiasis showed that they were highest in the months from June through August. This seems to indicate that the time of infection, over-work and under-nourishment during the farming season, and wasting of the body during summer have an important bearing on the occurrence of the disease. (4) The chief complaints of patients with ancylostomiasis included languor (in 20 per cent of patients), dizziness, palpitation, shortness of breath and headache (in over 10 per cent of them). This observation agrees well with the observations of various workers. The author feels that the disturbance caused by latent infection with hookworms is an important factor in the onset and aggravation of the so-called "farmers' disease." Investigations conducted on infection with Ancylostoma duodenale and Necator americanum among 621 farmers from the three communities of Murakami, Wanme and Aikawa, which had had a high incidence of ancylostomiasis among their inhabitants visiting the outpatients' consulting room of Goi Health Center, revealed the following results : (1) The rate of hookworm infections in the three communities was as high as 75.4 , per cent, there being no difference between men and women in the rate. (2) The rate of hookworm infections was low among younger age groups and high among grownups, agreeing well with the results of investigations by other workers. It is worthy of note that the rate among the age groups 5-14 (children of school age) was 50 per cent. The curve representing the rates of hookworm infections among different age groups shows that the rate of hookworm infection among the age group 16-19 nearly corresponded to the average rate of infection among the whole population. (3) The areas under study proved to have a mixed infection, the ratio of A. duodenale infections to N. americanum infections being 1:1.1. The number of the worms of N. americanum expelled in the stools was greater than that of the worms of A. duodenale, the ratio being 1:4. (4) The average numbers of worms expelled per person were: A. duodenale, 14.4 and N. americanum, 48.7. This shows that hookworm infections in the areas under study were not only widespread as witnessed to by the high rate of infections but also massive, each individual harboring great numbers of worms. The greatest numbers of worms expelled from a single person were 74 worms of A. duodenale and 2,057 worms of N. americanum. The numbers of the two different species of worms expelled by men were twice as many as those expelled by women. (5) The curves representing the infection with the two species of worms among various age groups showed that the rates of infections were low among younger age groups, tending to be higher among older age groups. The curves representing the numbers of the two species of worms expelled by persons belonging to various age groups showed a similar tendency. It appeared that the hookworm larvae gained entrance to the body mainly by way of the skin in these areas.
- 千葉大学の論文
- 1959-01-28