Ecological studies on Japanese encephalitis in Osaka Prefecture : 1. Decrease of the paddy field area and the number of livestock breeding farms in relation to incidence of human cases during 1965-1986

央, 中村; 和雄, 武衛; 貞夫, 中島; 寿美代, 伊藤; 政弘, 吉田; 明生, 木村; 孝博, 弓指; 昇, 上羽; 好一, 峯川; 貞男, 藤戸; 敏行, 北浦; 信治, 國田

doi:10.7601/mez.43.195

Cited by 4 publications

(1 citation statement)

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“…The aetiological agent, JE virus, belongs to the family Flaviviridae which was separated from the family Togaviridae in 1985 [2]. The virus has been well-known to distribute along with an ecosystem in which paddy cultivation and pig raising were co-existing [3,4]. In Taiwan, Culex annulus, Cx.…”

Section: Introductionmentioning

confidence: 99%

Assessment of neutralizing antibodies elicited by a vaccine (Nakayama) strain of Japanese encephalitis virus in Taiwan

Shyu

Wang²,

Chin³

et al. 1997

Epidemiol. Infect.

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A total of 368 blood specimens were resampled from a serum collection containing 2914 blood samples which were collected by a random sampling in Taiwan in 1991. The plaque reduction neutralization test was applied to evaluate the neutralizing ability to two strains of Japanese encephalitis viruses, i.e. Nakayama (the present vaccine strain) and JE5 (a Taiwan isolate). The result revealed that antibodies against JE virus were present in each stratified age group. Antibody positive rates were both highest in the group older than 70 years although the lowest rates were located in different groups. In addition, the result showed that the immunogenicity potency of the antibody induced by the vaccine strain did not have a good coverage against JE5. The rate of neutralizing antibodies above the level of protective efficacy of the present vaccine was limited as low as 37.93%. Efficacy of the vaccine used at present was apparently not efficient. Consideration of a more promising vaccine may be necessary.

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Section: Introductionmentioning

confidence: 99%

Assessment of neutralizing antibodies elicited by a vaccine (Nakayama) strain of Japanese encephalitis virus in Taiwan

Shyu

Wang²,

Chin³

et al. 1997

Epidemiol. Infect.

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Ecological studies on Japanese encephalitis (JE) in Osaka Prefecture : 4. Relations of summer meteorological conditions to the number of human JE cases and to the size of vector populations, especially with regard to recent low epidemics of JE

央

政弘

明生

et al. 1999

Jap. J. Sanit. Zool.

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In two areas under different environmental conditions for the breed − ing of Culex tritaeniorhynchus ， the vector mosquito of Japanese encephalitis (JE) virus ， the relation between the mosquito abundance and yearly data Qf meteorologi ・ cal conditions was analyzed statistically ， especially in relation to the urbanization for the period 1968 − 1990 in Osaka Prefecture ． Correlation coef 行cients of the devia ． tion from regression between the mean number of mosquitoes caught during July and that caught during August， to the cummulative temperatures Qr total amount of precipitation during five different periQds were calculated ． In the barn near pad ・ dy field there were correlation between the two meteorological factors and the devia − tion from regression with a maximum deviation， However ， recently there were little correlation between them with a minimum deviation for any barn during the years 1968 − 1990 ， as environmental conditions in the areas around the barns in which mosquitoes were collected became less appropriate for the mosquito breeding year by year． Therefore ， the more the appropriateness of environmental conditions for the mosquito breeding lowers ， the more the effectiveness of meteorological condi − tions on the level of mosquito population lowers． This may be a reason for recent fewer JE cases in spite of the favorable meteorological conditions for the breeding of Cx． tn ' taeniorhynchus． The effect of summer temperature on the epidemic size was observed only for the period 1968 − 1972 ． No trend was discerned after that period， N 工工一 Eleotronio Library

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Ecological studies on Japanese encephalitis in Osaka Prefecture : 5. Abundance and infection with the virus in Culex tritaeniorhynchus in relation to environmental conditions for mosquito breeding

Nakamura

Yoshida

Kimura

et al. 1999

Jap. J. Sanit. Zool.

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Field investigations have been carried out on Cutex tritaeniorhynchus abundance and seasonality of Japanese encephalitis {JE) virus activity in areas under The JapanSociety of Medical Entomology and Zoology 276 the JE virus was isolated from 1O pools of mosquitoes weekly at each collection site. An emulsion (2 ml) of each pool of mosquitoes was prepared. Virus isolation was performed by inoculation into the brain of suckling mice aged 3-4 days between 1968 *i Mosquitoes for virus isolation were collected around the two piggeries.

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Ecological studies on Japanese encephalitis in Osaka Prefecture : 1. Decrease of the paddy field area and the number of livestock breeding farms in relation to incidence of human cases during 1965-1986

Cited by 4 publications

References 0 publications

Assessment of neutralizing antibodies elicited by a vaccine (Nakayama) strain of Japanese encephalitis virus in Taiwan

Assessment of neutralizing antibodies elicited by a vaccine (Nakayama) strain of Japanese encephalitis virus in Taiwan

Ecological studies on Japanese encephalitis (JE) in Osaka Prefecture : 4. Relations of summer meteorological conditions to the number of human JE cases and to the size of vector populations, especially with regard to recent low epidemics of JE

Ecological studies on Japanese encephalitis in Osaka Prefecture : 5. Abundance and infection with the virus in Culex tritaeniorhynchus in relation to environmental conditions for mosquito breeding

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