Epidemiology of Japanese Encephalitis

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  • 日本脳炎の疫学
  • ニホン ノウエン ノ エキガク キンネン ゲンショウ ノ リユウ ニ カンスル
  • Factor Analyses of Obvious Decline of Japanese Encephalitis Infection in Recent Years
  • 近年減少の理由に関する考察

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Abstract

Dissemination or amplification of Japanese encephalitis (JE) virus in summer through the pig-mosquito-pig cycle was consistently found in the Natori District of Miyagi Prefecture over a period from 1964 to 1974 when the time of initial appearance of vector mosquitoes was examined and when antibody response was pursued in pigs at weekly intervals. Analysis of the results of the field survey revealed a gradual decrease in the breeding number of vector mosquitoes (Culex tritaeniorhynchus) and a delay in the date of appearance of vector mosquitoes toward 1974. These changes were correlated to the obvious decline of JE infection recently noticed among pigs and human beings in Miyagi Prefecture.<BR>Then several factors which might affect the breeding density of vector mosquitoes were discussed. As a result, the meteorological conditions, especially the sum total of atmospheric temperatures, were found to have a positive correlation with the density of mosquitoes. The effect of spraying insecticides on rice fields, however, did not reveal a positive correlation to the breeding of vector mosquitoes.

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