Publication: Rickettsia gravesii sp. Nov.: A novel spotted fever group rickettsia in Western Australian Amblyomma triguttatum triguttatum ticks
Issued Date
2017-09-01
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ISSN
14665026
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2-s2.0-85029586186
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Mahidol University
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SCOPUS
Bibliographic Citation
International Journal of Systematic and Evolutionary Microbiology. Vol.67, No.9 (2017), 3156-3161
Suggested Citation
Mohammad Y. Abdad, Rita Abou Abdallah, Khalid El Karkouri, Mamadou Beye, John Stenos, Helen Owen, Nathan Unsworth, Ian Robertson, Stuart D. Blacksell, Thi Tien Nguyen, Claude Nappez, Didier Raoult, Stan Fenwick, Pierre Edouard Fournier Rickettsia gravesii sp. Nov.: A novel spotted fever group rickettsia in Western Australian Amblyomma triguttatum triguttatum ticks. International Journal of Systematic and Evolutionary Microbiology. Vol.67, No.9 (2017), 3156-3161. doi:10.1099/ijsem.0.001865 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/41396
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Title
Rickettsia gravesii sp. Nov.: A novel spotted fever group rickettsia in Western Australian Amblyomma triguttatum triguttatum ticks
Abstract
© 2017 IUMS. A rickettsial organism harboured by Amblyomma triguttatum ticks on Barrow Island, Western Australia, was discovered after reports of possible rickettsiosis among local workers. Subsequent isolation of this rickettsia (strain BWI-1) in cell culture and analysis of its phylogenetic, genotypic and phenotypic relationships with type strains of Rickettsia species with standing in nomenclature suggested that it was sufficiently divergent to warrant its classification as a new species. Multiple gene comparison of strain BWI-1 revealed degrees of sequence similarity with Rickettsia raoultii, its closest relative, of 99.58, 98.89, 97.03, 96.93 and 95.73% for the 16S rRNA, citrate synthase, ompA, ompB and sca4 genes, respectively. Serotyping in mice also demonstrated that strain BWI-1Twas distinct from Rickettsia raoultii. Thus, we propose the naming of a new species, Rickettsia gravesii sp. nov., based on its novel genotypic and phenotypic characteristics. Strain BWI-1Twas deposited in the ATCC, CSUR and ARRL collections under reference numbers VR-1664, CSUR R172 and RGBWI-1, respectively.