Epidemiological Studies on Japanese Encephalitis in Kyoto City Area, Japan Ii. Annual Patterns of Virus Dissemination on Virus Recoveries From Unfed Culex Tritaeniorhynchus Summorosus

Maeda, Osamu; Karaki, Toshiro; Kuroda, Akio; Karoji, Yoshiaki; Sasaki, Osamu; Takenokuma, Kunihachi

doi:10.7883/yoken1952.31.39

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…It is active in twilight and bites outdoors. It was reported that there was a positive relationship between the number of mosquitoes and that of JE cases [11]. The complex effect of precipitation on the antibody-positive rate in pigs may be in part due to positive and negative effects of precipitation on life-cycle of the vector mosquito.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Precipitation on the Transmission of Japanese Encephalitis (JE) Virus in Nature: A Complex Effect on Antibody-Positive Rate to JE Virus in Sentinel Pigs

Kurane

Shibasaki

Kotaki

et al. 2013

IJERPH

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Japanese encephalitis (JE) is one of the most important mosquito-borne viral diseases in Asia. Pigs are a natural host and the amplifier of JE virus. The sero-conversion rate to JE virus in sentinel pigs reflects the activity of JE virus in the region. We analyzed whether precipitation has any effect on the sero-conversion rate to JE virus in sentinel pigs. Linear regression analysis was performed to determine the correlations between the levels of precipitation and sero-conversion rates to JE virus, in the entire year and during summertime over the period of 32 years from 1969 to 2000. The levels of the annual and summertime precipitation demonstrated statistically significant positive correlations with sero-conversion rates for the whole of the country and for some regions in Japan. The levels of the summertime precipitation, on the other hand, demonstrated statistically significant inverse correlations with the sero-conversion rates in other regions. Further, the levels of precipitation during preceding 10-day periods from days 1–40 before blood collection showed inverse correlation with antibody-positive rates in some regions. The results indicate that the relationship between the annual and summertime precipitation, and the sero-conversion rate to JE virus is complex; both positive and inverse effects are demonstrated depending on the regions.

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Section: Resultsmentioning

confidence: 99%

The Effect of Precipitation on the Transmission of Japanese Encephalitis (JE) Virus in Nature: A Complex Effect on Antibody-Positive Rate to JE Virus in Sentinel Pigs

Kurane

Shibasaki

Kotaki

et al. 2013

IJERPH

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“…The important role of pigs as the amplifying animal has generally been recognized , since Sherer et al (1959) suggested so on the bases of (a) high incidence of natural infection in pigs, (b) the occurrence of viremia following natural and experimental infection, (c) the infection in C. tritaeniorhynchus by biting viremic pigs , and (d) preference of C. tritaeniorhynchus to bite pigs in nature . At some stations around Kyoto City, dissemination of JE virus in the vector mosquitoes have been investigated annually since 1965 on the basis of virus recovery from unfed C. tritaeniorhynchus as reported before (Maeda et al,1978). The dissemination may have originated mostly from the mosquitoes infected by feeding 277 on viremic pigs in pig sheds.…”

Section: Introductionmentioning

confidence: 99%

Epidemiological Studies on Japanese Encephalitis in Kyoto City Area, Japan Iii. Seasonal Prevalence of Virus Infections in Several Pig Populations Shown by Virus Recovery From Engorged Culex Tritaeniorhynchus Summorosus

Maeda

Karaki

Kuroda

et al. 1978

JJMSB

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SUMMARY : When vector mosquitoes engorged by feeding on pigs are tested for virus recovery after incubation for 7 to 10 days, the results may show mosquito infection itself. Therefore, seasonal prevalence of infection in each pig population can be estimated from course of the infection rate among mosquitoes. Many mosquitoes of the main vector of Japanese encephalitis virus, Culex tritaeniorhynchus summorosus, collected by light traps everyday or every other day in some pig sheds from 1967 to 1970 were tested for virus recovery after incubation. The tests were positive during about a month period each summer, and the peak infection rate was high being over 10%. The course of the mosquito infection showed a certain pattern with one or two peaks between the initial recovery and the highest peak. From the interval of 12 to 13 days after the first recovery to the peak , cyclic infection b etween the pig and the mosquito may occur at the same interval.

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Japanese Encephalitis Virus: Ecology and Epidemiology

Endy

Nisalak

2002

Current Topics in Microbiology and Immunology

197

184

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Epidemiological Studies on Japanese Encephalitis in Kyoto City Area, Japan Ii. Annual Patterns of Virus Dissemination on Virus Recoveries From Unfed Culex Tritaeniorhynchus Summorosus

Cited by 6 publications

References 8 publications

The Effect of Precipitation on the Transmission of Japanese Encephalitis (JE) Virus in Nature: A Complex Effect on Antibody-Positive Rate to JE Virus in Sentinel Pigs

The Effect of Precipitation on the Transmission of Japanese Encephalitis (JE) Virus in Nature: A Complex Effect on Antibody-Positive Rate to JE Virus in Sentinel Pigs

Epidemiological Studies on Japanese Encephalitis in Kyoto City Area, Japan Iii. Seasonal Prevalence of Virus Infections in Several Pig Populations Shown by Virus Recovery From Engorged Culex Tritaeniorhynchus Summorosus

Japanese Encephalitis Virus: Ecology and Epidemiology

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