Epidemiological Studies on Japanese Encephalitis in Kyoto City Area, Japan Iv. Natural Infection in Sentinel Pigs

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

doi:10.7883/yoken1952.31.317

Cited by 11 publications

(2 citation statements)

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“…Cx. tritaeniorhynchus is highly susceptible to viral infection; studies suggest that over 30% become infected after feeding on a viremic pig [ 20 ]. Mosquito populations are dependent on environmental and seasonal factors for their propagation.…”

Section: Introductionmentioning

confidence: 99%

The relationship between mosquito abundance and rice field density in the Republic of Korea

et al. 2010

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BackgroundJapanese encephalitis virus (JEV), the causative agent of Japanese encephalitis (JE), is endemic to the Republic of Korea (ROK) where unvaccinated United States (U.S.) military Service members, civilians and family members are stationed. The primary vector of the JEV in the ROK is Culex tritaeniorhynchus. The ecological relationship between Culex spp. and rice fields has been studied extensively; rice fields have been shown to increase the prevalence of Cx. tritaeniorhynchus. This research was conducted to determine if the quantification of rice field land cover surrounding U.S. military installations in the ROK should be used as a parameter in a larger risk model that predicts the abundance of Cx. tritaeniorhynchus populations.Mosquito data from the U.S. Forces Korea (USFK) mosquito surveillance program were used in this project. The average number of female Cx. tritaeniorhynchus collected per trap night for the months of August and September, 2002-2008, was calculated. Rice fields were manually digitized inside 1.5 km buffer zones surrounding U.S. military installations on high-resolution satellite images, and the proportion of rice fields was calculated for each buffer zone.ResultsMosquito data collected from seventeen sample sites were analyzed for an association with the proportion of rice field land cover. Results demonstrated that the linear relationship between the proportion of rice fields and mosquito abundance was statistically significant (R2 = 0.62, r = .79, F = 22.72, p < 0.001).ConclusionsThe analysis presented shows a statistically significant linear relationship between the two parameters, proportion of rice field land cover and log10 of the average number of Cx. tritaeniorhynchus collected per trap night. The findings confirm that agricultural land cover should be included in future studies to develop JE risk prediction models for non-indigenous personnel living at military installations in the ROK.

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Section: Introductionmentioning

confidence: 99%

The relationship between mosquito abundance and rice field density in the Republic of Korea

et al. 2010

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“…As an exception, the number of mosquitoes collected was the largest in [1982][1983][1984] during the total surveillance period in Sijyonawate. (Kamimura and Maruyama, 1983;Yasutomi and Takahashi, 1987;Yoshida et al, 1984;Nakamura et al, 1984 (Shimada, 1974;Buei et al 1977;Maeda et al 1978;Mogi, 1978 (Buei et al, 1974, l982). Why was the critical level of mosquito abundance below which JE virus isolation disappears high in Moyama? In 1995 and 1996 in which the nurnber of mosquitoes collected was below the threshold of JE virus isolation, 2-ME-sensitive antibody was detected in swine on August 3 and July 31, respectively, but an HI antibody positive rate did not reach 100.0% during August (Kimura et al 1996(Kimura et al , 1997.…”

Section: Nii-electronic Library Servicementioning

confidence: 99%