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Title: Rickettsia gravesii sp. Nov.: A novel spotted fever group rickettsia in Western Australian Amblyomma triguttatum triguttatum ticks
Authors: 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
Murdoch University
Geelong Hospital
Unité de Recherche sur les Maladies Infectieuses et Tropicales émergentes
Land Division
Mahidol University
University of Oxford
Faculte de Medecine de Marseille Universite de la Mediterranee
Keywords: Agricultural and Biological Sciences;Immunology and Microbiology
Issue Date: 1-Sep-2017
Citation: International Journal of Systematic and Evolutionary Microbiology. Vol.67, No.9 (2017), 3156-3161
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.
ISSN: 14665026
Appears in Collections:Scopus 2016-2017

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