EPIDEMIOLOGICAL STUDIES ON JAPANESE ENCEPHALITIS IN KYOTO CITY AREA, JAPAN II. ANNUAL PATTERNS OF VIRUS DISSEMINATION ON VIRUS RECOVERIES FROM UNFED CULEX TRITAENIORHYNCHUS SUMMOROSUS

Abstract
Annual patterns of dissemination of Japanese encephalitis virus in vector mosquitoes were investigated at the main collection station from 1965 through 1973 and at some other stations from 1969 through 1971. The virus was recovered usually from C. tritaeniorhynchus summorosus during a period of about 1 mo. from July to August every year till 1969, and from Aug. to Sept. after 1970, although at some of the stations the virus was recovered intermittently for longer or shorter terms. Higher infection rates were recorded with the mosquitoes caught at the stations near pig sheds than at the stations far from pig sheds. The infection rates at the peak of virus recovery in high epidemic years (1965-1967) were higher, being over 2%, than those in lower or latent epidemic years (1968-1973). Japanese encephalitis patients were found in 17-20 days after the appearance of the highest peak of the infection rate in mosquitoes.

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