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

Takahashi, M.; Urakami, Hiroshi; Misumi, Hiroyasu; Noda, Shinichi; Yamamoto, Susumu; Suzuki, Hiroshi; Matsumoto, Isao

doi:10.7601/mez.53.65_1

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…Another clinical and epidemiological opinion is that unengorged chigger mites are more critical and appropriate than engorged chigger mites, primarily in determining chigger vectors. Other researchers have used unfed chigger mites to assess the true reservoir of O. tsutsugamushi [ 11 , 13 , 20 , 21 ]. In nature, infected chigger mites have a high transmission ability.…”

Section: Discussionmentioning

confidence: 99%

“…Unfortunately, we could not test O. tsutsugamushi infections in unfed chigger mites, and further studies are needed to analyze the O. tsutsugamushi prevalence in unfed larvae in an epidemiologically meaningful manner. Other studies have used unfed larvae to identify the prevalence of O. tsutsugamushi infection, including L. scutellare (3.0%) and N. japonica (100%) in Japan [ 11 ], H. miyagawai (MIR 2.6%) in the Republic of Korea [ 13 ], L. scutellare (0.01%) in Japan [ 20 ], and L. pallidum (15.6%) and L. intermedium (0.1%) in Japan [ 21 ]. Normally, it is difficult to individually conduct both species identification and an assessment of infection rates of O. tsutsugamushi in large-scale assays of chigger mites.…”

Section: Discussionmentioning

confidence: 99%

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Nationwide Incidence of Chigger Mite Populations and Molecular Detection of Orientia tsutsugamushi in the Republic of Korea, 2020

et al. 2021

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The Korea Disease Control and Prevention Agency has established regional centers at 16 locations to monitor vectors and pathogens. We investigated the geographical and temporal distribution of chigger mite populations to understand tsutsugamushi disease epidemiology in 2020. To monitor weekly chigger mite populations, 3637 chigger mites were collected from sticky chigger mite traps in autumn. Chigger mites appeared from the first week of October to the third week of December, peaking in the fourth week of October. The predominant species were Leptotrombidium scutellare, Leptotrombidium palpale, Neotrombicula kwangneungensis, Neotrombicula tamiyai, and Leptotrombidium pallidum. To monitor Orientia tsutsugamushi infection in chigger mites, 50,153 chigger mites were collected from 499 trapped wild rodents in spring and autumn, with a chigger index of 100.5. Approximately 50% of chigger mites were pooled into 998 pools, and the minimum infection rate (MIR) of O. tsutsugamushi was 0.1%. Jeongeup had the highest MIR for O. tsutsugamushi (0.7%). The Kato-related genotype was the most common (52.2%), followed by the Karp-related (17.4%), Boryong (13.0%), JG-related (8.7%), Shimokoshi (4.3%), and Kawasaki (4.3%) genotypes. Ecological and geographical studies focusing on the basic ecology and pathology of mites will improve our understanding of tsutsugamushi disease risks in the Republic of Korea.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Nationwide Incidence of Chigger Mite Populations and Molecular Detection of Orientia tsutsugamushi in the Republic of Korea, 2020

et al. 2021

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“…ree cases of tsutsugamushi disease were reported from this area. Orientia tsutsugamushi Hayashi was detected from the unfed larval trombiculid mite L. scutellare (Takahashi et al, 2002). Doloisia uchikawai Suzuki, Yamamoto et Noda described by Suzuki et al (2003) was collected in this area.…”

Section: Mmentioning

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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“…lected from an endemic area tested positive for O. tsutsugamushi (Takahashi et al, 2002 In Kagoshima Prefecture, surveys were carried out along five routes in December 1997 and 1998: The survey areas were designated Rl-R5, respectively. Accordingly, Rl =Sukeshiro to Isakutouge, Fukiage…”

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Occurrence of Leptotrombidium scutellare larvae in Kagoshima and Nagasaki Prefectures

Noda

Yamamoto

Yoshiie

et al. 2002

Jap. J. Sanit. Zool.

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The occurrence of larva] trombicu]id mites in different vegetation types was surveyed in Kagoshima and Nagasaki Prefectures. In Kagoshima Prefecture, 1O species were collected at three sites. Loptotrombidium sczetellare was dominant, followed by L. Pattidum and L. ,fttji L. scutellare and L, Pallidum were collected in three vegetation types, The biggest numbers of both species were recorded at the natural woods of two sites and at the grassland of one site. In Nagasaki Prefecture, four species were collected at three sites, and L, scutellare was also dominant, L. scutellare was collected in two vegetation types. The greater number of L. scutellare was recorded at the grassland of two sites and at the natural woods of one site. The distribution of L, scutellare larvae was also surveyed along roads passing through hilly and rnountainous areas of both prefectures. In Kagoshima Prefecture, the collection of larval trombiculid mites with a black cloth (Suzuki's method) was carried out at 52 sites along five routes, and L. scuteltare was found in 41 sites (78.8%). In Nagasaki Prefecture, the collection of larval trombiculid mites was carried out at 43 sites along five routes, and L, sctttellare was found in 4 sites (9.3%). The wide occurrence and high density of vector mites seems to relate to the number of patients in Kagoshima Prefecture.

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

Cited by 8 publications

References 13 publications

Nationwide Incidence of Chigger Mite Populations and Molecular Detection of Orientia tsutsugamushi in the Republic of Korea, 2020

Nationwide Incidence of Chigger Mite Populations and Molecular Detection of Orientia tsutsugamushi in the Republic of Korea, 2020

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

Occurrence of Leptotrombidium scutellare larvae in Kagoshima and Nagasaki Prefectures

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