千葉県下一農村における鉤虫の再感染に関する研究
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概要
- 論文の詳細を見る
In Matsuo-machi, Chiba Prefacture, a rural district, epidemiological studies and mass treatment on the hookworm were carried out from November, 1961, to October, 1963. One thousand one hundred and six samples, whole inhabitants in the six villages of this town, were selected for study: The infection rate of hookworm amoung these villages ranged from 52% to 57%, except one village in which mass treatment on the hookworm had taken one year ago, where Necator americanus was predominant. For study on the re-infection (includes new-infection) of hookworm, these villages were separated to two groups, the one was once given mass treatment on the hookworm at January, 1962 (A-group), the another repeatedly twice at January and March, 1962 (Bgroup), and the both again at January, 1963. The following results were obtained. 1. The infection rate of hookworm in A-group has decreased from 55.0% to 10.2% during the study, in B-group from 54.0% to 5.2%. 2. The total of re-infection in A-group during the study was ll.4% (Ancylostoma duodenale 3.7%, Necator Americanus 6.8%), in B-grup 7.5% (Ancylostoma duodenale 2.6%, Necator Americanus 4.9%). 3. The seasonal changes in the incidence of re-infection displayed two peaks at Spring and Autumn in Ancylostoma duodenale, one peak during from Spring and Autumn in Necator americanus. 4. The incidence of re-infection of Necator americanus was found higher in percentage amoung the samples working in fields, especially in relative small one, for many days and lower amoung those having no/or seldom chance of farming, but on Ancylostoma duodenale such a results was not obtained. 5. The familial aggregation about the incidence of re-infection was markedly recognized about both of these hookworm species.
- 千葉大学の論文
- 1963-11-28