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Epidemiological studies on japanese encephalitis virus between 1965 and 1980


, : Epidemiological studies on japanese encephalitis virus between 1965 and 1980. Okayama Igakkai Zasshi 93(9-10): 963-968

Variations in the amount of Japanese encephalitis (JE) virus in the field and outbreaks of JE were examined. The causes of change in outbreaks were examined. The level of JE virus estimated by hemagglutination inhibition and the z-mercaptoethanol (2-ME) reaction of swine JE tended to decrease from 1972-1977, and tended to increase from 1978-1980. Positive rates 2-ME reactions in 1978-1980 were higher than those in 1965-1971. The number of JE patients was > 50 from 1965-1967, thereafter it decreased and no JE patients were detected from 1971-1977. In 1978, 2 definite cases and 1 suspected case were recognized. In 1979, 1 suspected case was identified and 1 definite case was seen in 1980. The decrease in the number of JE patients are due to the facts that the sizes of pigsties were increased and sanitary conditions were improved.

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