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Epidemiological studies of japanese encephalitis in shiga prefecture 1965 1973 part 4 summary and conclusions

, : Epidemiological studies of japanese encephalitis in shiga prefecture 1965 1973 part 4 summary and conclusions. Journal of the Kansai Medical University 29(4): 696-703

The results of epidemiological studies of Japanese encephalitis (JE) in Shiga Prefecture, Japan, between 1965-1973 are summarized. Based on the results obtained in these study series, certain possibilities regarding epidemic outbreaks of JE in the future were suggested. Throughout the investigation, a gradual decrease in human incidence was observed. This correlated well with the decrease of vector mosquitoes (Culex tritaeniorhynchus). Changes in meteorological conditions and the amounts of 2 insecticides sprayed were discussed as reasons for the decrease of vector mosquitoes. Despite the parallel decline of human infection and mosquito number, the JE virus (JEV) infection rate in swine born in a nonepidemic season reached 100% the next summer season. There must be certain animals which originally supply JEV to swine. Some are hibernating animals in which JEV passes the winter; others are migratory birds by which JEV is transported from endemic areas to Japan. The possibility of an epidemic outbreak of JE still remains in Japan. Care must be taken to exclude the epidemic factors by extermination of vector mosquitoes and maintaining social immunity by vaccination of man and domestic animals.

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