大阪府における日本脳炎の生態学的研究 : 4. 日本脳炎患者数とコガタアカイエカの発生量に及ぼす気象条件の影響, 特に近年の低流行に関連して

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In two areas under different environmental conditions for the breeding of Culex tritaeniorhynchus, the vector mosquito of Japanese encephalitis (JE) virus, the relation between the mosquito abundance and yearly data of meteorological conditions was analyzed statistically, especially in relation to the urbanization for the period 1968-1990 in Osaka Prefecture. Correlation coefficients of the deviation from regression between the mean number of mosquitoes caught during July and that caught during August, to the cummulative temperatures or total amount of precipitation during five different periods were calculated. In the barn near paddy field there were correlation between the two meteorological factors and the deviation from regression with a maximum deviation. However, recently there were little correlation between them with a minimum deviation for any barn during the years 1968-1990,as environmental conditions in the areas around the barns in which mosquitoes were collected became less appropriate for the mosquito breeding year by year. Therefore, the more the appropriateness of environmental conditions for the mosquito breeding lowers, the more the effectiveness of meteorological conditions on the level of mosquito population lowers. This may be a reason for recent fewer JE cases in spite of the favorable meteorological conditions for the breeding of Cx. tritaeniorhynchus. The effect of summer temperature on the epidemic size was observed only for the period 1968-1972. No trend was discerned after that period.
日本衛生動物学会の論文
1999-09-15

大阪府における日本脳炎の生態学的研究 : 4. 日本脳炎患者数とコガタアカイエカの発生量に及ぼす気象条件の影響, 特に近年の低流行に関連して

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