Abstract
To reveal the genetic diversity of Babesia microti and Theileria orientalis in Southwest China, we conducted a molecular survey of piroplasms in hard ticks in a China-Myanmar border county. Host infesting and questing ticks were collected from Tengchong County in 2013 and 2014. Piroplasm infection in ticks was detected by PCR, and then, phylogenetic analysis was conducted to study the genetic diversity of the pathogens identified in ticks. All in all, six piroplasm species comprising of B. microti; B. orientalis; a novel Babesia species designated Babesia sp. Tengchong, China; T. orientalis; T. luwenshuni; and an as yet undescribed piroplasmid species referred to as Piroplasmid sp. Tengchong, China, have been identified after screening goat- and cattle-attached ticks. In addition, B. bigemina has been identified by screening questing ticks. Phylogenetic analysis based on the 18S rRNA and partial β-tubulin gene revealed two novel potentially zoonotic genotypes designated B. microti Tengchong-Type A and B. The T. orientalis genotypes identified in the present study represent the seven known genotypes 1–5, 7, and N3 as revealed by phylogenetic analysis of 18S rRNA and MPSP genes. Importantly, an additional genotype designated N4 has also been identified in this study, which brings the number of recognized T. orientalis genotypes to a total of twelve. Thus, besides the two novel species, Babesia sp. Tengchong, China, closely related to Babesia species isolated from yak and Piroplasmid sp. Tengchong, China, our study demonstrates that additional novel B. microti and T. orientalis genotypes exist in Southwest China.
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Funding
This work was partially supported by the Special Fund for Basic Resources in Science and Technology (no. 2017FY101203), the National Key Research and Development Program of China (nos. 2016YFC1200500 and 2016YFC1202001), the fourth round of the Three-Year Public Health Action Plan (no. GWIV-29), Shandong Provincial Natural Science Foundation (no. ZR2019MH093), and National Natural Science Foundation of China (no. 81902095).
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LHL designed the investigation, performed the experiments and drafted the manuscript. JZW, DZ, XSL, SQY, and ZGL conducted the field investigation. YL performed the experiments and data analysis. YZ and XNZ conceived the study and revised the manuscript. All authors read and approved the final manuscript.
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Li, LH., Wang, JZ., Zhu, D. et al. Detection of novel piroplasmid species and Babesia microti and Theileria orientalis genotypes in hard ticks from Tengchong County, Southwest China. Parasitol Res 119, 1259–1269 (2020). https://doi.org/10.1007/s00436-020-06622-6
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DOI: https://doi.org/10.1007/s00436-020-06622-6