Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Molecular Epidemiology Characteristics of Brucella abortus Strains in China and Their Relationships with World Lineages

Version 1 : Received: 24 November 2020 / Approved: 25 November 2020 / Online: 25 November 2020 (11:01:59 CET)

How to cite: Wang, X.; Zhao, Z.; wang, M.; cui, B.; Liu, Z.; Li, Z. Molecular Epidemiology Characteristics of Brucella abortus Strains in China and Their Relationships with World Lineages. Preprints 2020, 2020110632 (doi: 10.20944/preprints202011.0632.v1). Wang, X.; Zhao, Z.; wang, M.; cui, B.; Liu, Z.; Li, Z. Molecular Epidemiology Characteristics of Brucella abortus Strains in China and Their Relationships with World Lineages. Preprints 2020, 2020110632 (doi: 10.20944/preprints202011.0632.v1).

Abstract

Brucella abortus is a facultative intracellular Gram-negative bacterium that causes chronic persistent infections in humans and livestock. In this study, conventional bio-typing, multiple-locus variable-number tandem repeat analysis (MLVA), and whole-genome sequencing-single-nucleotide polymorphism (WGS-SNP) were used to investigate the molecular epidemiology characteristics of Brucella abortus strains in China and their relationships to world lineages. A total of 100 strains were collected from 1953 to 2013, suggesting that B. abortus circulated in China in the past five decades. Moreover, most strains were mainly distributed in the northwest area. During this period, seven biovars were found, indicating that B. abortus displayed a high diversity of biovars and that the main epidemic areas are in the northern provinces. Strains have high genetic diversity, and bruce07 is the most helpful locus for genotyping of this population. Moreover, 17 MLVA-11 genotypes were found; 13 of them are of known genotypes and four are unassigned genotypes, indicating that B. abortus in this study had several geographic origins. Still, strains from unassigned genotypes may originate from China. Many shared MLVA-16 genotypes were observed in strains from the same provinces in Northern China, which confirmed a brucellosis outbreak within northern regions. WGS-SNP analysis showed that eight Chinese strains formed a ladder-like phylogram (C. Ⅶ) with strains from nine countries, including Uganda, Iraq, Russia, Georgia, Spain, Italy, Egypt, Mongolia, and China; strains were introduced to these countries from a single source. Notably, Chinese strains were closely related to strains from Russia and Mongolia; frequent animal (cattle) trade and exchanges may promote this process. We will provide new and insightful information for strength surveillance and control of B. abortus brucellosis in China.

Keywords

B. abortus; molecular epidemiology; MLVA; WGS-SNP; China

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