SUSCEPTIBILITY OF FOUR SPECIES OF MOSQUITOES TO JAPANESE ENCEPHALITIS VIRUS AS EXAMINED BY LARVAL INFECTION

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1. Susceptibility to Japanese encephalitis (JE) virus was compared among 4 species of mosquitoes, Culex tritaeniorhynchus, C. pipiens pallens, C. orientalis and Aedes albopictus, by examining the larval infection. It was confirmed in a preliminary experiment that the larval infection was accomplished effectively by dipping 4th instar larvae into virus suspension (JaGAr 01 strain of JE virus at a titer of 106-107 icLD50/0.02ml in suckling mice) at 27°C for 1hr and then rearing them until the harvest when checked 10 days after the treatment.2. It was observed that 1-day chicks engorged by the above-mentioned infected mosquitoes presented viremia and subsequently produced HI antibody against JE virus. This indicates that mosquitoes infected by the above-mentioned procedure were not only retentive of the virus, but also fully capable of transmitting the virus.3. C. tritaeniorhynchus, C. pipiens pallens, and C. orientalis were susceptible to JE virus, although the latter two were less susceptible than the former one. Aedes albopictus was not susceptible to this virus.
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