Arbovirus infections in the mosquitoes of Fukuoka area, Kyushu, Japan : 3. Natural infection of mosquitoes with Japanese encephalitis virus in the period from 1963 to 1972

The present paper summarizes the results of the linear studies on the natural infection of mosquitoes with Japanese encephalitis virus in Fukuoka area in the period from 1963 to 1972 when the epidemics of Japanese encephalitis were yearly prevalent among residents. Descriptions and discussions are given principally of the annual and local variations in infection pattern, infection rate and infection time of Culex tritaeniorhynchus mosquitoes.