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Genetic diversity and multidrug resistance of phylogenic groups B2 and D in InPEC and ExPEC isolated from chickens in Central China

文献类型： 外文期刊

作者： Lu, Qin 1 ; Zhang, Wenting 1 ; Luo, Ling 1 ; Wang, Honglin 1 ; Shao, Huabin 1 ; Zhang, Tengfei 1 ; Luo, Qingping 1 ;

作者机构： 1.Hubei Acad Agr Sci, Inst Anim Husb & Vet, Minist Agr & Rural Affairs, Key Lab Prevent & Control Agents Anim Bacteriosis, Wuhan 430064, Peoples R China

2.Hubei Acad Agr Sci, Inst Anim Husb & Vet, Hubei Prov Key Lab Anim Pathogen Microbiol, Wuhan 430064, Peoples R China

关键词： Escherichia coli; Phylogenic group; MLST; Antimicrobial resistance pattern; Virulence-associated genes

期刊名称：BMC MICROBIOLOGY （ 影响因子：4.465； 五年影响因子：4.818 ）

ISSN： 1471-2180

年卷期： 2022 年 22 卷 1 期

页码：

收录情况： SCI

摘要： Background Avian colibacillosis is an infectious bacterial disease caused by avian pathogenic Escherichia coli (APEC). APEC causes a wide variety of intestinal and extraintestinal infections, including InPEC and ExPEC, which result in enormous losses in the poultry industry. In this study, we investigated the prevalence of InPEC and ExPEC in Central China, and the isolates were characterized using molecular approaches and tested for virulence factors and antibiotic resistance. Results A total of 200 chicken-derived E. coli isolates were collected for study from 2019 and 2020. The prevalence of B2 and D phylogenic groups in the 200 chicken-derived E. coli was verified by triplex PCR, which accounted for 50.53% (48/95) and 9.52% (10/105) in ExPEC and InPEC, respectively. Additionally, multilocus sequence typing method was used to examine the genetic diversity of these E. coli isolates, which showed that the dominant STs of ExPEC included ST117 (n = 10, 20.83%), ST297 (n = 5, 10.42%), ST93 (n = 4, 8.33%), ST1426 (n = 4, 8.33%) and ST10 (n = 3, 6.25%), while the dominant ST of InPEC was ST117 (n = 2, 20%). Furthermore, antimicrobial susceptibility tests of 16 antibiotics for those strains were conducted. The result showed that more than 60% of the ExPEC and InPEC were resistant to streptomycin and nalidixic acid. Among these streptomycin resistant isolates (n = 49), 99.76% harbored aminoglycoside resistance gene strA, and 63.27% harbored strB. Among these nalidixic acid resistant isolates (n = 38), 94.74% harbored a S83L mutation in gyrA, and 44.74% harbored a D87N mutation in gyrA. Moreover, the prevalence of multidrug-resistant (MDR) in the isolates of ExPEC and InPEC was 31.25% (15/48) and 20% (2/10), respectively. Alarmingly, 8.33% (4/48) of the ExPEC and 20% (2/10) of the InPEC were extensively drug-resistant (XDR). Finally, the presence of 13 virulence-associated genes was checked in these isolates, which over 95% of the ExPEC and InPEC strains harbored irp2, feoB, fimH, ompT, ompA. 10.42% of the ExPEC and 10% of the InPEC were positive for kpsM. Only ExPEC isolates carried ibeA gene, and the rate was 4.17%. All tested strains were negative to LT and cnf genes. The carrying rate of iss and iutA were significantly different between the InPEC and ExPEC isolates (P < 0.01). Conclusions To the best of our knowledge, this is the first report on the highly pathogenic groups of InPEC and ExPEC in Central China. We find that 50.53% (48/95) of the ExPEC belong to the D/B2 phylogenic group. The emergence of XDR and MDR strains and potential virulence genes may indicate the complicated treatment of the infections caused by APEC. This study will improve our understanding of the prevalence and pathogenicity of APEC.

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