1978•Japanese Journal of Medical Science and BiologyOpen access

EPIDEMIOLOGICAL STUDIES ON JAPANESE ENCEPHALITIS IN KYOTO CITY AREA, JAPAN IV. NATURAL INFECTION IN SENTINEL PIGS

Osamu MAEDA, Kunihachi Takenokuma, Yoshiaki Karoji, Akio Kuroda, Osamu Sasaki, Toshiro Karaki, Takashi Ishii

Abstract

Natural infection with Japanese encephalitis virus in three sentinel pigs held in separate experimental huts was examined daily by virus recovery from blood samples of the pigs and from mosquitoes after incubation for about 7 days from their blood feeding and by HI antibody titration of the blood samples. After a period of low infection rates, below 6%, for about two weeks in engorged Culex tritaeniorhynchus summorosus, high mosquito infections of over 30% from each viremic pig occurred for two to three days. The pigs may be probably have been bitten by many infected but not infective mosquitoes in a period of about 10 days before infection.

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Key concepts: Culex tritaeniorhynchus, Japanese encephalitis, Virology, Incubation period, Encephalitis, Biology, Veterinary medicine, Virus