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Detection of Novel Spotted Fever Group Rickettsiae (Rickettsiales: Rickettsiaceae) in Ticks (Acari: Ixodidae) in Southwestern China.

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机构： [1]School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, P. R. China. [2]State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China. [3]Yunnan Institute for Endemic Diseases Control and Prevention, Dali, Yunnan, P. R. China. [4]Guangxi Zhuang Autonomous Region Terrestrial Wildlife Medical-Aid and Monitoring Epidemic Diseases Research Center, Nanning, Guangxi, P. R. China. [5]Guizhou Provincial People's Hospital, Guiyang, Guizhou, P. R. China. [6]Guizhou Medical University, Guiyang, Guizhou, P. R. China. [7]Wulong County Animal Husbandry Bureau, Wulong, Chongqing, P. R. China. [8]Shanghai Institute for Emerging and Re-emerging Infectious Diseases, Shanghai Public Health Clinical Center, Shanghai, P. R. China. [9]Center for Medical Genetics and Genomics, The Second Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, P. R. China.

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Spotted fever group rickettsiae, mainly maintained and transmitted by ticks, are important etiological agents of (re)emerging zoonotic diseases worldwide. It is of great significance to investigate spotted fever group rickettsiae in ticks in different areas for the prevention and control of rickettsioses. In this study, a total of 305 ticks were collected from wild and domestic animals in Chongqing, Guizhou, Yunnan, and Guangxi provinces of southwestern China during 2017-2019 and examined for the presence of spotted fever group rickettsiae by PCR with primers targeting the partial gltA, ompA, rrs, and htrA genes. Results showed that two spotted fever group rickettsiae species, including the pathogenic Candidatus Rickettsia jingxinensis (Rickettsiales: Rickettsiaceae) and a potential novel species Rickettsia sp. sw (Rickettsiales: Rickettsiaceae), were identified. The Ca. R. jingxinensis sequences were recovered from Rhipicephalus microplus (Ixodida: Ixodidae) and Haemaphysalis longicornis (Ixodida: Ixodidae) ticks and phylogenetically clustered with previous Ca. R. jingxinensis, Ca. R. longicornii (Rickettsiales: Rickettsiaceae), and Rickettsia sp. XY118 (Rickettsiales: Rickettsiaceae) strains. Rickettsia sp. sw was detected in Amblyomma geoemydae (Ixodida: Ixodidae) and Rh. microplus. Interestingly, as far as we know, this was the first report of Rickettsia (Rickettsiales: Rickettsiaceae) in A. geoemydae. Phylogenetic analyses indicated that this potential novel species was closely related to R. aeschlimannii (Rickettsiales: Rickettsiaceae) with gltA and ompA genes and grouped in a cluster composed of R. montanensis (Rickettsiales: Rickettsiaceae), R. raoultii (Rickettsiales: Rickettsiaceae), R. aeschlimannii, R. massiliae (Rickettsiales: Rickettsiaceae), and R. rhipicephali (Rickettsiales: Rickettsiaceae) with htrA, while formed a separate clade with rrs. The pathogenicity of Rickettsia sp. sw should be further confirmed. These results expand the knowledge of the geographical distribution and vector distribution of spotted fever group rickettsiae in China and are useful for assessing the potential public health risk. © The Author(s) 2021. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

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出版当年[2021]版：

大类 | 3 区农林科学

小类 | 3 区昆虫学 3 区兽医学

最新[2023]版：

大类 | 3 区农林科学

小类 | 2 区昆虫学 3 区兽医学

第一作者：

第一作者机构： [1]School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, P. R. China. [2]State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China.

通讯作者：

通讯机构： [1]School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, P. R. China. [2]State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China.

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