Molecular identification of Rickettsia spp. in chigger mites in Taiwan

Chi Chien Kuo, Pei Lung Lee, Hsi Chieh Wang*


研究成果: 雜誌貢獻期刊論文同行評審

4 引文 斯高帕斯(Scopus)


The genus Rickettsia is the causative agent of several rickettsial diseases that are primarily transmitted by hard ticks. The occurrence of Rickettsia in chigger mites, which are vectors of scrub typhus in the western Pacific region, has been infrequently investigated. We identified Rickettsia spp. in chiggers collected from small mammals in six counties of Taiwan. Moreover, by capitalising on parallel Rickettsia detections on small mammals and their infested ticks and fleas, we were able to identify Rickettsia spp. that suggested more intimate associations with chigger mites. Rickettsia detection rates in 318 pools of chiggers were 21.7% and 22.3% when based on the ompB and gltA gene, respectively. Overall, we identified six (based on the ompB gene) and eight (gltA gene) Rickettsia species. Approximately half of the sequenced species were most similar to Rickettsia sp. clone MB74-1 (ompB gene) and Rickettsia sp. TwKM02 (gltA gene). Furthermore, both species were either infrequently or never identified in small mammals, ticks and fleas, which suggests that chigger mites might be the primary host of both rickettsiae. Whether both species are pathogenic to humans remains to be studied. They may also be microbial endosymbionts of chigger mites, with their potential effects on the pathogenicity of the aetiologic agent of scrub typhus deserving further investigations.

頁(從 - 到)223-229
期刊Medical and Veterinary Entomology
出版狀態已發佈 - 2022 6月

ASJC Scopus subject areas

  • 寄生物學
  • 生態學、進化論、行為學與系統學
  • 獸醫 (全部)
  • 昆蟲科學


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