大阪府における日本脳炎の生態学的研究 : 1. 水田面積, 家畜飼育農家戸数の減少と患者の発生状況(1965-1986年)

概要

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Statistical data on the area of paddy fields and the number of livestock breeding farms in Osaka Prefecture during the period 1965-1986 were analyzed in relation to the recent reduction in the number of human Japanese encephalitis cases. Large numbers of human cases occurred in Osaka City in the epidemic years, 1965-1967. The reasons for the outbreak were considered to be : 1) the density of swine farms was relatively high in Osaka City; 2) the districts in the outskirts of Osaka City had developed paddy fields and a relatively high density of swine farms; and 3) the urban heat island wind enhanced centripetal invasion of the mosquitoes. Since 1973,the number of human cases has been only 0 to 3 a year in Osaka Prefecture and no cases occurred in Osaka City. Urbanization of the rural outskirts of Osaka City which resulted in significant decrease in swine farms and paddy fields throughout Osaka Prefecture may be responsible for the recent reduction in epidemics.
日本衛生動物学会の論文
1992-09-15