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

Noda, Shinichi; Yamamoto, Susumu; Uchikawa, Kimito

doi:10.7601/mez.47.339

Cited by 10 publications

(7 citation statements)

References 13 publications

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“…In Oita Prefecture, L. pallidum is also thought to serve as a vector in some municipalities. Both L. scutellare and L. pallidum were collected in Miyazaki and Kagoshima Prefecture as well as in Oita prefecture (23, 24).…”

Section: Discussionmentioning

confidence: 99%

Epidemiological characteristics of tsutsugamushi disease in Oita Prefecture, Japan: Yearly and monthly occurrences of its infections and serotypes of its causative agent, Orientia tsutsugamushi, during 1984–2005

Ogawa

Ono²

2008

Microbiology and Immunology

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Using indirect immunofluorescence assay, we examined the sera of 561 patients from November 1984 to February 2005 to determine the incidence of tsutsugamushi disease (scrub typhus) in Oita Prefecture, Japan. The results obtained were positive in 384 individuals (68.4%). Municipalities where patients were presumed to have been infected with Orientia tsutsugamushi were Taketa City (41.7%), Oyama Town (13.5%), and Ogi Town (8.3%). Infections occurred most often in October, November, and December. A small number of cases occurred from January to May. The serotypes Kuroki (47.5%), Kawasaki (42.5%), and Karp (10.0%) were detected by genetic analysis of O. tsutsugamushi DNA extracted from the blood of 120 patients. The gene sequences of the Kuroki type were highly homologous to that of the Nishino strain. The gene sequences of the Kawasaki type were identical to that of the Kawasaki strain. The gene sequence of the Karp type was highly homologous to that of the JP-2 type. To determine the distribution of vector mites, 558 wild rodents were captured and 72010 mites attached to these rodents were collected from 1982 to 1998. Six genera and 16 species of trombiculid mites were collected. Leptotrombidium pallidum and L. scutellare, which are known to be mite vectors for tsutsugamushi disease, accounted for 20.5% and 5.9%, respectively, of all trombiculid mites collected. The geographical distribution of cases roughly coincided with the distribution of L. scutellare. In Oita Prefecture, L. scutellare is presumed to primarily transmit tsutsugamushi disease. In addition, our results also suggest that L. pallidum transmits the Karp type of the causative rickettsia in some municipalities.

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Section: Discussionmentioning

confidence: 99%

Epidemiological characteristics of tsutsugamushi disease in Oita Prefecture, Japan: Yearly and monthly occurrences of its infections and serotypes of its causative agent, Orientia tsutsugamushi, during 1984–2005

Ogawa

Ono²

2008

Microbiology and Immunology

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“…e occurrence of larval trombiculid mites may di er from year to year. e seasonal occurrence of unfed larvae of trombiculid mites was surveyed using Tullgren s funnel method in Nagano Prefecture and Kagoshima Prefecture (Uchikawa and Kumada, 1987;Noda et al, 1996), but few investigations were carried for over one year.…”

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confidence: 99%

Seasonal occurrence of larval trombiculid mites by Tullgren's funnel method in Kagoshima Prefecture for three years,with a few references to morphological variations

Noda

Yamamoto

Takahashi

2013

Jap. J. Sanit. Zool.

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Seasonal occurrence of larval trombiculid mites was surveyed at two adjacent areas using Tullgren s funnel method for three years. Larval trombiculid mites were collected every month from April 2004 to March 2007 at two adjacent areas of Aira City, Kagoshima Prefecture. Twenty trombiculid species were collected from soil samples: Neotrombicula mitamurai, Eltonella ichikawai, Miyatrombicula kochiensis, Cheladonta ikaoensis, Doloisia uchikawai, Helenicula miyagawai, Mackiena todai, Neoschoengastia shiraii, Schoutedenichia nagasakiensis, Walchia koshikiensis, W. ogatai and Gahrliepia saduski.Almost all species were collected in February and March, and only seven species were collected in June and July. L. scutellare was the most abundant in number, followed by L. fuji. erefore, L. scutellare and L. fuji seemed to be the dominant species in the survey areas. e morphological variation of C. ikaoensis was also observed. e scutum of C. ikaoensis was very wide, especially PW much wider than AW, and variable in the number of rst post humeral row of dorsal setae.

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“…The Japan Society of Medical Entomology and Zoology (Fukuda et al 1955(Fukuda et al , 1958Kawabata et al, 1985;Yamamoto et al,, 1989Yamamoto et al,, , 1990Yamamoto et al,, , 1997a (Kawamori et al 1992(Kawamori et al , 1993 In the present study, the prevalence of the infection in unfed larvae of L. scutellare was estimated to be less than O,05% et al,, 1993;Noda et al 1996;Suzuki, 1996). In the present study, we also made certain of the effectiveness of this sampling method.…”

Section: Out Of More Than 40 Species Which Hadmentioning

confidence: 53%

“…The Japan Society of Medical Entomology and Zoology (Noda et al 1996;Yamamoto and Noda, 1995;Suzuki, 1996). However, a small number of El miyngawai have been also collected by this method in Oita Prefecture, as was reported by Pham et al (1999).…”

Section: Nii-electronicmentioning

confidence: 99%

Detection and serotyping of Orientia tsutsugamushi from the unfed larval trombiculid mite Leptotrombidium scutellare

Takahashi

Urakami²,

Misumi

et al. 2002

Jap. J. Sanit. Zool.

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Detection and serotyping of Orientia tsutsugamushi from individual unfed larval trombiculid mites, whose cuticles remained, were performed by the immunofiuorescent technique in three areas including an endemic area of Tsutsugamushi disease in Kagoshima Prefecture, A total of 9,540 unfed larvae ofLoptotrombidium scutellare and 31 of Helenicuta miycrgawai were collected by the black cloth method over 120 minutes. Of the above two species, 6,775 out of 9,571 unfed larvae were examined for O. tsutsugamushi by the immunofiuorescent technique. One unfed larva L, scutellare collected from the endemic area tested positive for O, tsutsugamushi and the serotype was determined as Kawasaki type O. tsutsugzzmushi by the immunofluerescent technique using the serotype specific monoclonal antibody, The natural infection rate of the ethiologic agent O. tsutsugamushi to the larvae L. scutellare in one endemic area was estimated to be less than O.05%. Moreover, a total of 71 unfed larvae consisting of four species, L, scutellare, L. fwfi, L. leitasatoi and Cheladonta ikaoensis, and three adults were recovered from five seil sarnples from the above endemic area. Here, all mites from soil samples tested negative for O. tsutsugamushi.

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

Cited by 10 publications

References 13 publications

Epidemiological characteristics of tsutsugamushi disease in Oita Prefecture, Japan: Yearly and monthly occurrences of its infections and serotypes of its causative agent, Orientia tsutsugamushi, during 1984–2005

Epidemiological characteristics of tsutsugamushi disease in Oita Prefecture, Japan: Yearly and monthly occurrences of its infections and serotypes of its causative agent, Orientia tsutsugamushi, during 1984–2005

Seasonal occurrence of larval trombiculid mites by Tullgren's funnel method in Kagoshima Prefecture for three years,with a few references to morphological variations

Detection and serotyping of Orientia tsutsugamushi from the unfed larval trombiculid mite Leptotrombidium scutellare

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