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Molecular Characteristics of ESBL-producing Isolated from Chickens with Colibacillosis

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Journal J Vet Sci
Date 2022 Mar 25
PMID 35332711
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Abstract

Background: Avian pathogenic (APEC) causes colibacillosis, resulting in significant economic losses in the poultry industry.

Objectives: In this study, the molecular characteristics of two extended-spectrum beta-lactamase (ESBL)-producing APEC isolates were compared with previously reported ESBL-producing isolates.

Methods: The molecular characteristics of isolates and the genetic environments of the ESBL genes were investigated using whole genome sequencing.

Results: The two ESBL-producing APEC were classified into the phylogenetic groups C and B1 and ST410 and ST162, respectively. Moreover, the ESBL genes of the two isolates were harbored in different Inc plasmids. The EC1809182 strain, harboring the gene on the plasmid, exhibited extensive homology to IncFIB (98.4%) and IncFIC(FII) (95.8%). The EC1809191 strain, harboring the gene, was homologous to IncI1-I (Gamma) (99.3%). All chromosomes carried the multidrug transporter, gene. Mobile genetic elements, adjacent to CTX-M genes, facilitated the dissemination of genes in the two isolates, analogous to other ESBL-producing isolates.

Conclusions: This study clarifies the transmission dynamics of CTX-M genes and supports strengthened surveillance to prevent the transmission of the antimicrobial-resistant genes to humans via the food chain.

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