An epidemiological study using Scotch tape method, the perianal examination of eggs, together with interview of inhabitants was carried out at Sizuka Mura, one of the model sanitation villages in Saitama Prefecture, in August, 1956. In 46 persons out of 177 belonging 40 families examined, pinworm eggs were detected. No significant differences of positive rate in habitats, sexes, occupations, or incomes were observed. The positive rate observed in age groups, however, differed remarkably, i. e. age group 0 to 4 showed 11.8%, 51.7%, the highest rate becomes at the age group 5 to 9, and gradually declined toward age group more than 40 (8.9%).
The tendency of familial aggregation of infections was very conspicious. No correlations were observed between the infection rates and the frequency of bathings or changing underwears. The only suspicious condition related to the rate was the space of the bed room, higher incidences were observed in the families lived in smaller spaces. The average number of the standard Tatami, Japanese Straw Mattless, per person in the bed room was 2.22 in the non-infected families, but 1.73 in the infected ones.
A correlation was also seen between the rate in infection of mother and their children, but was not significant between fathers and their children. There was observed very high relation between the incidence in husbands and that in their wives.
From epidemiological observations mentioned above, it was concluded that the infection of pinworms may cause by the contact in wider sease among various factors.
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