Novel spotted fever group rickettsiae in Haemaphysalis qinghaiensis ticks from Gansu, Northwest China

文献类型： 外文期刊

第一作者： Yang, Jifei

作者： Yang, Jifei;Tian, Zhancheng;Liu, Zhijie;Niu, Qingli;Han, Rong;Li, Youquan;Guan, Guiquan;Liu, Junlong;Liu, Guangyuan;Luo, Jianxun;Yin, Hong;Yin, Hong

作者机构：

关键词： gltA gene;ompA gene;Tick;Rickettsia sp;SFG rickettsia

期刊名称：PARASITES & VECTORS （ 影响因子：3.876； 五年影响因子：3.959 ）

ISSN： 1756-3305

年卷期： 2016 年 9 卷

页码：

收录情况： SCI

摘要： Background: Rickettsia spp. are obligate intracellular bacteria and well known as transmitted by arthropods. These pathogens have a broad geographic distribution and a high degree of biological and clinical diversity. This study was conducted to determine the prevalence and molecular characterization of Rickettsia spp. in ticks collected from Gansu, where Borrelia burgdorferi sensu lato and Anaplasma phagocytophilum were previously reported in ticks and ruminants. Methods: A total of 1,583 questing Haemaphysalis qinghaiensis ticks were collected and tested for the presence of Rickettsia spp. gltA gene by PCR. Samples positive for gltA were examined by specific primers targeted for the ompA gene of SFG rickettsiae. The infections were further validated by sequencing and positive samples were genetically characterized based on the gltA and ompA genes. Results: In total, Rickettsia spp. infection was found in 179 (18.5 %) H. qinghaiensis tick pools by using PCR and primers specific for the gltA gene. Of those, 157 (16.3 %) tick pools were positive for SFG rickettsiae by PCR based on ompA gene. Amplification and molecular analysis of the nucleotide sequences of gltA and ompA genes indicated three potential novel spotted fever group rickettsiae in H. qinghaiensis ticks. These three potential novel spotted fever group rickettsiae were clustered together in a subgroup, which represents a sister taxon to and separates from other known four SFG rickettsiae subgroups. Conclusions: This study revealed a high infection rate of SFG rickettsiae in H. qinghaiensis ticks in northwest China. Three potential novel spotted fever group rickettsiae classified into a novel SFG rickettsiae subgroup were identified and named "Candidatus Rickettsia gannanii" related strains in recognition of the location where it was first detected.

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