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Light-trap studies on the seasonal prevalence of Culex tritaeniorhynehus Giles were conducted during the period from 1963 to 1972 in specified study sites of the Fukuoka area. The results of the studies are subject to the inquiries into the relations with the natura] infection patterns of the mosquito with Japanese encephalitis virus and the epidemic sizes of Japanese encephalitis. The vector populations had been infected in their increasing phases in the severe epidemic period before 1967 but often in their decreasing phases in the mild epidemic period after 1966, The period changes in mode of vector infection and epidemic size might be attributed to a chronic tendency tewards decline of vector populations. Despite of the above facts, the annual variation in the onset time of vector infection was responsible for year-to-year fluctuation in epidemic size in the mird epidemic period as well as in the severe epidemic period. The epidemics of Japanese encephalitis (JE) had yearly broken out among residents of Fukuoka area with a wide variation in size in the period from the middle 1950's to the rniddle 1960's, but the epidemics were extremely reduced in size in the area as well as in the ether areas of Japan since the late 1960's, It might be of epidemiological importance to manifest what factors took part in the annual variation in epidemic size in the past. *mJ4iectw: asmavacatsthetiysJkYNntJi<$pttsnrpmpva39) (+818-Ol The 3rd paper of this series (Yamamoto, 1981) revealed the annual patterns of Japanese encephalitis virus (JEV) infection of Culex tritaeniorhynchus Giles in the Fukuoka area during the period from 1963 to 1972, and suggested that the field patterns of mosquito infection might have to be discussed in relation to the pepulation dynamics of the mosquito. The present paper describes the annual sJariation in seasenal prevalence of the mosquito along with those in mosquito infection with JEV and JE epidemics in the area during that period, making an inquiry into epidemiological correlation among the 3

eisei doubutsu/eisei dobutsu

Arbovirus infections in the mosquitoes of Fukuoka area, Kyushu, Japan : 4. The epidemiological relations among the seasonal prevalence of the vector mosquitoes of Japanese encephalitis virus, the natural infection of the mosquitoes and the epidemic sizes of Japanese encephalitis