Studies on tsutsugamushi by Tullgren's funnel method : 3. Occurrence of vector trombiculid, Leptotrombidium pallidum, in the neighbourhood of patients' houses

内川, 公人; 熊田, 信夫; 山田, 喜紹

doi:10.7601/mez.39.13

Cited by 3 publications

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“…This concurs with our observations that many M. montebelli holes were found in raised beds by the waterways and footpaths between rice Þelds. Because L. pallidum and L. intermedium are commonly found at paddy banks and at the boundaries of daily human activity (Uchikawa et al 1988,, Uchikawa andKumada 1989), they are more likely to infest M. montebelli than A. speciosus, in agreement with our results. These data suggest that M. montebelli is an important host for maintaining vectors for scrub typhus in the study area.…”

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confidence: 92%

Mite Vectors (Acari: Trombiculidae) of Scrub Typhus in a New Endemic Area in Northern Kyoto, Japan

et al. 2004

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Between 1983 and 1999, 27 human cases of scrub typhus (two fatal) occurred in the Nodagawa River basin of northern Kyoto, Japan, an area where no cases had been previously reported. Antibody screening of infected patients' sera showed that nine of 15 patients had high titers against the Gilliam type of Orientia tsutsugamushi (Hayashi). To determine the vector mite transmitting the disease, we studied rodent and chigger populations in and near a rice field alongside the Nodagawa River between 1996 and 1999. The most common rodent species was Microtus montebelli (Milne-Edwards), representing 73.3% (33/45) of the population. The mite index (average number of mites per infested host) was highest (190.8) in Leptotrombidium pallidum Nagayo, Mitamura & Tamiya parasitizing on M. montebelli, followed by Leptotrombidium intermedium (Nagayo, Mitamura & Tamiya) (174.9) on the same host species. Orientia tsutsugamushi was isolated from 60.5% (23/38) of rodents and from 71.2% (37/52) of pools of engorged L. pallidum. The Gilliam type of O. tsutsugamushi was most prevalent in rodents, and in engorged L. pallidum and it was the only type recovered from 10 isolates inoculated into L 929 cells for indirect immunofluorescence examination. Orientia tsutsugamushi infected 14.3% (181/1263) and 14.8% (306/2066) of engorged and unfed L. pallidum larvae, respectively, and was also detected in 0.055% (2/3634) of unfed L. intermedium, although previous studies suggest that this mite rarely bites humans. These results show that L. pallidum is the primary vector species of scrub typhus in this new endemic area in Japan.

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Section: Discussionsupporting

confidence: 92%

Mite Vectors (Acari: Trombiculidae) of Scrub Typhus in a New Endemic Area in Northern Kyoto, Japan

et al. 2004

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“…The Japan Society of Medical Entomology and Zoology (Uchikawa and Kumada, 1989;Uchikawa et al 1983Uchikawa et al , 1988Uchikawa et al , 1990. We selected our survey areas for L. (Matsuno, et al, 1990;Adachi et aL, 1996;Nakajima et al 1996).…”

Section: Nii-electronicmentioning

confidence: 99%

Distributions of infective spots composed of unfed larvae infected with Orientia tsutsugamushi in Leptotrombidium mites and their annual fluctuations on the soil surface in an endemic area of tsutsugamushi disease (Acari : Trombiculidae)

Misumi

Takahashi

Urakami³

et al. 2002

Jap. J. Sanit. Zool.

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Seasonal occurrence of larval trombiculid mites and distribution of Leptotrombidium scutellare in residential area and farmland in Kagoshima Prefecture

Noda

Yamamoto

Uchikawa

1996

Jap. J. Sanit. Zool.

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Studies on tsutsugamushi by Tullgren's funnel method : 3. Occurrence of vector trombiculid, Leptotrombidium pallidum, in the neighbourhood of patients' houses

Abstract: Studies on tsutsugamushi by Tullgren ' s funnel method 3 ． Occurrence of vector trombiculid ， Laptotronzbidium pallidum， in the neighbourhood of patients ' houses

Cited by 3 publications

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Mite Vectors (Acari: Trombiculidae) of Scrub Typhus in a New Endemic Area in Northern Kyoto, Japan

Mite Vectors (Acari: Trombiculidae) of Scrub Typhus in a New Endemic Area in Northern Kyoto, Japan

Distributions of infective spots composed of unfed larvae infected with Orientia tsutsugamushi in Leptotrombidium mites and their annual fluctuations on the soil surface in an endemic area of tsutsugamushi disease (Acari : Trombiculidae)

Seasonal occurrence of larval trombiculid mites and distribution of Leptotrombidium scutellare in residential area and farmland in Kagoshima Prefecture

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