Phenotypic and Genomic Characterization of ESBL- and AmpC-β-Lactamase-Producing <i>Enterobacterales</i> Isolates from Imported Healthy Reptiles
Background/Objectives: Reptiles are known reservoirs for members of the <i>Enterobacterales</i>. We investigated antimicrobial resistance (AMR) patterns, the diversity of extended-spectrum-/AmpC-β-lactamases (ESBL/AmpC) genes and the genomic organization of the ESBL/AmpC producers. Metho...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Antibiotics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-6382/13/12/1230 |
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| Summary: | Background/Objectives: Reptiles are known reservoirs for members of the <i>Enterobacterales</i>. We investigated antimicrobial resistance (AMR) patterns, the diversity of extended-spectrum-/AmpC-β-lactamases (ESBL/AmpC) genes and the genomic organization of the ESBL/AmpC producers. Methods: A total of 92 shipments with 184 feces, skin, and urinate samples of live healthy reptiles were obtained during border inspections at Europe’s most important airport for animal trade and screened for AMR bacteria by culture, antimicrobial susceptibility testing, and whole genome sequencing (WGS) of selected isolates. Results: In total, 668 <i>Enterobacterales</i> isolates with phenotypic evidence for extended-spectrum-/AmpC-β-lactamases (ESBL/AmpC) were obtained, from which <i>Klebsiella</i> (<i>n</i> = 181), <i>Citrobacter</i> (<i>n</i> = 131), <i>Escherichia coli</i> (<i>n</i> = 116), <i>Salmonella</i> (<i>n</i> = 69), and <i>Enterobacter</i> (<i>n</i> = 52) represented the most common groups (other genera (<i>n</i> = 119)). Seventy-nine isolates grew also on cefotaxime agar and were confirmed as ESBL (<i>n</i> = 39) or AmpC (<i>n</i> = 39) producers based on WGS data with respective genes localized on chromosomes or plasmids. Isolates of <i>E. coli</i> contained the most diverse set of ESBL genes (<i>n</i> = 29), followed by <i>Klebsiella</i> (<i>n</i> = 9), <i>Citrobacter</i>, and <i>Enterobacter</i> (each <i>n</i> = 1). Contrarily, AmpC genes were detected in <i>E. coli</i> and <i>Citrobacter</i> (<i>n</i> = 13 each), followed by <i>Enterobacter</i> (<i>n</i> = 12) and <i>Klebsiella</i> (<i>n</i> = 4). Isolates of <i>Salmonella</i> with ESBL/AmpC genes were not found, but all genera contained a variety of additional AMR phenotypes and/or genotypes. MLST revealed 36, 13, 10, and nine different STs in <i>E. coli</i>, <i>Klebsiella</i>, <i>Citrobacter</i>, and <i>Enterobacter</i>, respectively. Conclusions: A significant fraction of the studied <i>Enterobacterales</i> isolates possessed acquired AMR genes, including some high-risk clones. All isolates were obtained from selective media and also wild-caught animals carried many AMR genes. Assignment of AMR to harvesting modes was not possible. |
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| ISSN: | 2079-6382 |