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Antibiotics
Special Issues
Antimicrobial Susceptibility of Veterinary Origin Bacteria
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Antimicrobial Susceptibility of Veterinary Origin Bacteria

A special issue of Antibiotics (ISSN 2079-6382). This special issue belongs to the section "Antibiotics in Animal Health".

Deadline for manuscript submissions: 30 November 2025 | Viewed by 732

Special Issue Editors

Prof. Dr. Luchao Lv

E-Mail Website
Guest Editor
College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
Interests: molecular microbiology; veterinary microbiology; bacterial antibiotic resistance
Dr. Jing Wang

E-Mail Website
Guest Editor
Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agrifood Safety and Quality, Ministry of Agriculture of China, Yangzhou University, Yangzhou 225009, China
Interests: salmonella; zoonotic pathogens; antibiotic-resistant bacteria

Special Issue Information

Dear Colleagues,

Antimicrobial resistance (AMR) poses a significant global public health challenge. Bacteria from animal sources play a critical role in the development of AMR, with animal-derived resistant bacteria threatening public health through clonal transmission via the food chain and the horizontal transfer of resistance genes via plasmids. Therefore, it is crucial to investigate the prevalence of antimicrobial-resistant bacteria from animals and to develop effective control strategies. We warmly invite scientists and researchers to submit original reviews and research articles to this Special Issue, focusing on the epidemiology of antibiotic-resistant foodborne pathogens.

Prof. Dr. Luchao Lv
Dr. Jing Wang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Antibiotics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • antimicrobial resistance
  • animal-derived resistant
  • antimicrobial-resistant bacteria
  • foodborne pathogens

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Published Papers (2 papers)

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Research

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11 pages, 998 KiB  
Article
Multiple Copies of Tigecycline Gene Cluster tmexC6D6-toprJ1b in Pseudomonas mendocina in a Swine Farm
by Renjie Wu, Yongliang Che, Longbai Wang, Qiuyong Chen, Bing He, Jingli Qiu, Xuemin Wu, Rujing Chen, Yutao Liu and Lunjiang Zhou
Antibiotics 2025, 14(5), 500; https://doi.org/10.3390/antibiotics14050500 - 13 May 2025
Abstract
Background/Objectives: The emergence and transmission of the tigecycline resistance efflux pump gene cluster tmexCD-toprJ among humans, animals and the environment have posed a serious threat to public health. The objective of this study was to characterize Pseudomonas strains carrying multiple copies of tmexC6D6-toprJ1b [...] Read more.
Background/Objectives: The emergence and transmission of the tigecycline resistance efflux pump gene cluster tmexCD-toprJ among humans, animals and the environment have posed a serious threat to public health. The objective of this study was to characterize Pseudomonas strains carrying multiple copies of tmexC6D6-toprJ1b from a pig farm and illustrate the genetic context of tmexC6D6-toprJ1b in the NCBI database. Methods: The characterization of Pseudomonas strains FJFQ21PNM23 and FJFQ21PNM24 was determined by antimicrobial susceptibility testing, whole-genome sequencing, and RT-qPCR. Results: The tmexCD-toprJ-positive P. mendocina strains FJFQ21PNM23 and FJFQ21PNM24 were isolated from nasal swabs in a pig farm. Sequence analysis showed that the two P. mendocina strains harbored multiple antimicrobial resistance genes, including tigecycline resistance gene tmexC6D6-toprJ1b. WGS analysis indicated that tmexC6D6-toprJ1b gene was located on a classical transferable module (int1-int2-hp1-hp2-tnfxB-tmexCD-toprJ) and a multiresistance region in FJFQ21PNM24 and FJFQ21PNM23, respectively. Further analysis revealed that 39 additional tmexC6D6-toprJ1b genes in the NCBI database were all identified in Pseudomonas spp., and the genetic features of tmexC6D6-toprJ1b were summarized into three distinct structures. Conclusions: This study is the first to identify and report the tigecycline resistance gene tmexCD-toprJ in a swine farm. Our findings summarize the three structures in the genetic context of tmexC6D6-toprJ1b and reveal that Pseudomonas serves as the only known reservoir of tmexC6D6-toprJ1b. Full article
(This article belongs to the Special Issue Antimicrobial Susceptibility of Veterinary Origin Bacteria)
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9 pages, 761 KiB  
Brief Report
Emergence of Linezolid Resistance Genes optrA and cfr(D) in an Enterococcus saccharolyticus from Chicken
by Xun Gao, Xiao Luo, Ruorou Qian, Guolong Gao, Jinghao Liu, Junhao Hong, Chao Yue, Jian-Hua Liu and Yi-Yun Liu
Antibiotics 2025, 14(4), 337; https://doi.org/10.3390/antibiotics14040337 - 24 Mar 2025
Viewed by 330
Abstract
Background: The emergence of linezolid resistance, mediated by genes such as optrA and cfr(D), poses a growing public health threat. While these genes have been detected in clinical and animal-derived Enterococcus species, their presence in underexplored species like Enterococcus saccharolyticus remains undocumented, [...] Read more.
Background: The emergence of linezolid resistance, mediated by genes such as optrA and cfr(D), poses a growing public health threat. While these genes have been detected in clinical and animal-derived Enterococcus species, their presence in underexplored species like Enterococcus saccharolyticus remains undocumented, leaving a significant gap in our understanding of their dissemination and stability. Method: E. saccharolyticus GXN23C125Es was screened for the presence of known linezolid resistance genes via PCR analysis. Conjugation and stability experiments were used to evaluate the transferability and stability of the resistance genes. The complete genome of GXN23C125Es was obtained using both the Illumina and Nanopore platforms. Results: We report the first identification of optrA and cfr(D) in GXN23C125Es from chicken feces in China. Whole-genome sequencing revealed multiple plasmid-borne resistance genes, including optrA, cfr(D), fexA, and erm(A). Stability testing demonstrated that optrA was highly stable, while cfr(D) was rapidly lost without selective pressure. Conclusions: These findings highlight E. saccharolyticus as a potential reservoir for linezolid resistance genes, underscoring the need for enhanced surveillance of resistance determinants in animal-associated bacteria. Understanding the dissemination dynamics of optrA and cfr(D) is crucial for mitigating their impact on public health and guiding antimicrobial resistance management strategies. Full article
(This article belongs to the Special Issue Antimicrobial Susceptibility of Veterinary Origin Bacteria)
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