大阪府における日本脳炎の生態学的研究 : 2. 患者数との関係におけるコガタアカイエカの発生消長に対する日本脳炎ウイルス感染蚊の出現時期の早晩と蚊の発生量(1967-1986年)

概要

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The ecological studies on Japanese encephalitis (JE) virus during the period 1967-1986 in Osaka Prefecture revealed the following points. 1) In areas with a large population of Culex tritaeniorhynchus, the mosquito-swine cycle of JE virus occurred every year, indicating build-up of dense populations of infected mosquitoes, and the peak of vector infection rate often occurred earlier than the peak of vector density. However, if the peak of vector infection rate occurred later than the peak of vector density, no cases of JE broke out despite the large mosquito population. Conversely, in any year that the peak of vector infection rate occurred earlier than the peak of vector density, JE cases tended to occur. 2) In areas with a small mosquito population, the transmission cycle of JE virus did not often occur, the peak of vector infection rate tended to occur later than the peak of vector density, and the density of infected mosquitoes might be low even if the peak of vector infection rate occurred earlier than the peak of vector density. Therefore, extremely few JE cases were expected. 3) It was suggested that only in areas with a large population of the mosquitoes, the timing of the peak of vector infection rate i.e., whether it was earlier or later than the peak of vector density, has significant impact on the transmission of the virus from the mosquito-swine cycle to man.
日本衛生動物学会の論文
1992-09-15