Population Structure, Genomic Features, and Antibiotic Resistance of Avian Pathogenic Escherichia coli in Shandong Province and Adjacent Regions, China (2008-2023)

文献类型： 外文期刊

第一作者： Song, Shikai

作者： Song, Shikai;Zhang, Rongling;Li, Kaiyuan;Yin, Bin;Yan, Zunxiang;Yang, Shifa;Lin, Shuqian;Yi, Yunpeng;Wang, Yao;Liu, Zhihai

作者机构：

关键词： avian pathogenic Escherichia coli; whole-genome sequencing; population structure; virulence; antimicrobial resistance

期刊名称：MICROORGANISMS （ 影响因子：4.2； 五年影响因子：4.6 ）

ISSN：

年卷期： 2025 年 13 卷 7 期

页码：

收录情况： SCI

摘要： Avian pathogenic Escherichia coli (APEC) poses a global threat to poultry health and public safety due to its high lethality, limited treatment options, and potential for zoonotic transmission via the food chain. However, long-term genomic surveillance remains limited, especially in countries like China where poultry farming is highly intensive. This study aimed to characterize the population structure, virulence traits, and antimicrobial resistance of 81 APEC isolates from diseased chickens collected over 16 years from Shandong and neighboring provinces in eastern China. The isolates were grouped into seven Clermont phylogroups, with A and B1 being dominant. MLST revealed 27 STs, and serotyping identified 29 O and 16 H antigens, showing high genetic diversity. The minor phylogroups (B2, C, D, E, G) encoded more virulence genes and had higher virulence-plasmid ColV carriage, with enrichment for iron-uptake, protectins, and extraintestinal toxins. In contrast, the dominant phylogroups A and B1 primarily carried adhesin and enterotoxin genes. Antimicrobial resistance was widespread: 76.5% of isolates were multidrug-resistant. The minor phylogroups exhibited higher tetracycline resistance (mediated by tet(A)), whereas the major phylogroups showed increased resistance to third- and fourth-generation cephalosporins (due to blaCTX-M-type ESBL genes). These findings offer crucial data for APEC prevention and control, safeguarding the poultry industry and public health.

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