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Molecular insights into Rickettsiales in blood and ticks of two-humped camels at Gansu Province, China: With an accidental detection of Colpodella sp.

文献类型： 外文期刊

作者： Muhammad Kashif Obaid;Xinting Lan;Qiaoyun Ren;Jehan Zeb;Jin Luo;Jifei Yang;Wenyu Jia;Xiaoqing Zan;Hong Yin;Muhammad Rashid;Guiquan Guan

作者机构：

关键词： Camelus bactrianus;Candidatus Rickettsia jingxinensis;Co-infection;Colpodella sp.;Haemaphysalis longicornis;Hyalomma asiaticum;Rickettsiales

期刊名称： Veterinary Microbiology

ISSN： 0378-1135

年卷期： 2025 年 305 卷

页码：

收录情况： SCIE（2025版）

摘要： Emerging infectious diseases caused by various tick-borne microorganisms (TBMs) pose public and animal health concerns, including camels, with no defined global distribution. In this study, 150 blood samples and 288 ticks were collected from symptomatic two-humped camels (Camelus bactrianus) in Gaotai County, Gansu Province, China. Morphologically identified ticks were confirmed using cytochrome oxidase I (COI), and the findings revealed two species, Hyalomma asiaticum and Haemaphysalis longicornis (prevalence: 245/288 [88.19 %] and 34/288 [11.81 %], respectively). The extracted Genomic DNA from blood and ticks was processed by conventional PCR to investigate the existing TBMs based on 16S rRNA, 18S rRNA, and 17-kDa genes. Different TBMs, including Anaplasma bovis, Colpodella sp., Rickettsia rickettsii, and Candidatus Rickettsia jingxinensis, have been documented as single infections at different rates. High single infection rates (198/218; 90.83 % and 117/150; 78.00 %) of A. bovis in Hy. asiaticum and camel blood were recorded, whereas the lowest single infection rate (3/22; 13.64 %) of R. rickettsii was noted in Hae. longicornis. Co-infection with Rickettsia spp. + A. bovis (20/288; 6.94 %), Colpodella sp. + A. bovis (14/288; 4.86 %), Colpodella sp. + Rickettsia spp. (1/288; 0.35 %), and Colpodella sp. + Rickettsia spp. + A. bovis (1/288; 0.35 %) were recorded as concurrent infection. Phylogenetic analysis revealed that the representative TBMs have close similarities and clustered together with their corresponding isolates from China, South Korea, India, the USA, Mexico, Bangladesh, Malawi, Japan, Pakistan, Cyprus, Nigeria, Poland, and Brazil. These findings present a preliminary baseline regarding TBMs infection in camel blood and ticks and provide a framework for further studies on the prevalence and effective control measures for ticks and tick-associated diseases.

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