Dermatosis caused by the bite of trombiculid mite larvae, Leptotrombidium intermedium (Nagayo, Mitamura et Tamiya, 1920) (Prostigmata : Trombiculidae)

Misumi, Hiroyasu; Takahashi, M.; Takahashi, Ken­ichi; Urakami, Hiroshi

doi:10.7601/mez.51.293

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…In an earlier study, researchers also isolated JP‐1 type O. tsutsugamushi from L. intermedium . However, as this species rarely bites humans , L. pallidum is more likely to play a significant role in disease transmission to humans.…”

Section: Discussionmentioning

confidence: 99%

Proposed vector candidate: Leptotrombidium palpale for Shimokoshi type Orientia tsutsugamushi

Seto

Suzuki

Otani

et al. 2013

Microbiology and Immunology

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To identify the vector species for Shimokoshi type Orientia tsutsugamushi, a survey of larval trombiculid mites was conducted in Yamagata Prefecture, Japan from April to May 2012. In all, 2889 larval trombiculid mites were obtained from 21 Apodemus speciosus rodent hosts, 2600 of which were morphologically classified into eight species in three genera. After screening of O. tsutsugamushi DNA in individual larval trombiculid mites using real-time PCR targeting the 16S ribosomal RNA gene, serotype-specific nested PCRs targeting the 56 kDa protein gene were performed, followed by sequencing analysis. As a result, Shimokoshi type O. tsutsugamushi DNA was identified from 3 (1.9%) of 157 Leptotrombidium palpale. This is the first study to identify Shimokoshi type O. tsutsugamushi DNA in L. palpale. The results indicate that L. palpale is a possible vector for Shimokoshi type O. tsutsugamushi.

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Section: Discussionmentioning

confidence: 99%

Proposed vector candidate: Leptotrombidium palpale for Shimokoshi type Orientia tsutsugamushi

Seto

Suzuki

Otani

et al. 2013

Microbiology and Immunology

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“…Moreover, unfed L. intermedium larvae usually with fairly low infestation rate seldom bite humans (Misumi et al, 2000).…”

Section: Nii-electronic Library Servicementioning

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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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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Dermatosis caused by the bite of trombiculid mite larvae, Leptotrombidium intermedium (Nagayo, Mitamura et Tamiya, 1920) (Prostigmata : Trombiculidae)

Cited by 6 publications

References 7 publications

Proposed vector candidate: Leptotrombidium palpale for Shimokoshi type Orientia tsutsugamushi

Proposed vector candidate: Leptotrombidium palpale for Shimokoshi type Orientia tsutsugamushi

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)

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

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