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Microorganisms
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Bacterial Infections and Antimicrobial Resistance in Animal Populations
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Bacterial Infections and Antimicrobial Resistance in Animal Populations

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Veterinary Microbiology".

Deadline for manuscript submissions: 31 August 2026 | Viewed by 6501

Special Issue Editor

Dr. Kwang Won Seo

E-Mail Website
Guest Editor
Laboratory of Veterinary Bacteriology and Infectious Diseases, College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
Interests: antimicrobial resistance; virulence factors; multiple drug resistance; transmission
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is a continuation of our 2024 Special Issue, "Bacterial Infections and Antimicrobial Resistance in Animals".

Pathogenic bacteria are an important source of disease that can threaten human and animal health. Among pathogenic bacteria and disease, zoonotic bacteria are very important within the One Health approach. In particular, antimicrobial resistance in pathogenic bacteria is more important than in any specific bacterium due to the spread of antibiotic resistance and pathogenic factors. Antimicrobial resistance can lead to failure in the treatment of diseases caused by pathogenic bacteria. Antimicrobial resistance (AMR) is among the most severe challenges facing public health this century. This threat is recognized as a global problem that has helped break the barriers of human health. AMR is reported in all compartments of the ecosystem and, accordingly with the WHO, CDC and ECDC, continuous surveillance continues to be a powerful tool in the fight against AMR. This Special Issue proposes to build upon the analysis of pathogenicity and antimicrobial resistance in pathogenic bacteria by attracting and agglutinating new data, updates, opinions, points of view, and scientific perspectives on pathogenic bacteria.

You are invited to submit research articles, review articles, and short communications related to the molecular characteristics, pathogenicity, immunology, and antimicrobial resistance of animal pathogenic bacteria.

Dr. Kwang Won Seo
Guest Editor

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 250 words) can be sent to the Editorial Office for assessment.

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. Microorganisms 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 2700 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

  • zoonotic foodborne bacteria
  • salmonellosis
  • antimicrobial resistance
  • virulence gene
  • multiple drug resistance
  • ESBL
  • beta-lactamases
  • PMQR
  • carbapenemases
  • MRSA

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Published Papers (4 papers)

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Research

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17 pages, 652 KB  
Article
Virulence Traits and Drug Resistance of STEC Isolated from Layer Poultry and Rattus Species
by Tsepo Ramatla, Jane Nkhebenyane, Kgaugelo E. Lekota, Mpho Tawana, Oriel Thekisoe and Ntelekwane G. Khasapane
Microorganisms 2026, 14(5), 977; https://doi.org/10.3390/microorganisms14050977 - 27 Apr 2026
Viewed by 191
Abstract
Shiga toxin-producing Escherichia coli (STEC) has emerged globally as a critical enteric foodborne zoonotic pathogen with significant public health implications. This study aimed to isolate and characterize STEC strains from Rattus spp. and layer chickens, specifically evaluating their antimicrobial resistance (AMR) profiles and [...] Read more.
Shiga toxin-producing Escherichia coli (STEC) has emerged globally as a critical enteric foodborne zoonotic pathogen with significant public health implications. This study aimed to isolate and characterize STEC strains from Rattus spp. and layer chickens, specifically evaluating their antimicrobial resistance (AMR) profiles and the prevalence of extended-spectrum β-lactamase (ESBL)-producing isolates. A total of 274 fecal samples were collected from Rattus spp. (n = 154) and layer chickens (n = 120). Isolates were characterized using standard microbiological techniques, PCR amplification of specific genes (including uidA and stx), and antimicrobial susceptibility testing via the disk diffusion method. Results: Of the 248 presumptive E. coli isolates, 237 (95.5%) were confirmed via uidA gene amplification. Fifty-eight isolates were confirmed as STEC, including key O-serogroups (O103, O111, O26, and O157). Resistance was most prevalent against colistin (39.6%) and streptomycin (20.6%), with 8.6% of isolates exhibiting multidrug resistance (MDR). Additionally, 19 isolates showed ESBL-producing phenotypes, and resistance genes for colistin, phenicols, aminoglycosides, and carbapenems were detected. The presence of STEC and MDR strains in both rodents and poultry highlights a high pathogenic potential and a serious zoonotic risk to public health, necessitating enhanced surveillance. Full article
(This article belongs to the Special Issue Bacterial Infections and Antimicrobial Resistance in Animal Populations)
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11 pages, 492 KB  
Communication
Identification of Hafnia alvei by MALDI-TOF MS and Their Antimicrobial Resistance Profiles from Milk of Dairy Cows with Subclinical Mastitis
by Khasapane George Ntelekwane
Microorganisms 2026, 14(4), 741; https://doi.org/10.3390/microorganisms14040741 - 26 Mar 2026
Viewed by 459
Abstract
Hafnia alvei, which belongs to the Enterobacteriaceae family, has been occasionally documented in animal infections but is still not well characterized in the context of bovine mastitis. This research examined the prevalence and antimicrobial resistance characteristics of H. alvei in dairy cows [...] Read more.
Hafnia alvei, which belongs to the Enterobacteriaceae family, has been occasionally documented in animal infections but is still not well characterized in the context of bovine mastitis. This research examined the prevalence and antimicrobial resistance characteristics of H. alvei in dairy cows suffering from subclinical mastitis in South Africa’s Free State Province. In the Thabo Mofutsanyana District, a total of 174 milk samples were obtained from cows on six different dairy farms. The California Mastitis Test (CMT) was used to screen for subclinical mastitis, and somatic cell count was used to confirm it. Standard culture methods were used for bacterial isolation, and presumptive Enterobacteriaceae isolates were identified through matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). Out of the 174 samples, 84 (48.2%) tested positive for CMT, and 68 (39.1%) met the SCC criteria for subclinical mastitis at a cow level, while 96/336 (28.5%) were infected at a quarter level. Of the 100 presumptive Enterobacteriaceae isolates, 33 (33.0%) were identified as H. alvei (p = 0.0034). Antimicrobial susceptibility testing showed that 50% of the isolates were resistant to penicillin, followed by tetracycline and erythromycin with 25% and 10%, respectively. Furthermore, the results showed that 17 (51.5%) isolates exhibited multidrug-resistant profiles. The results suggest that H. alvei could be a contaminant in raw milk associated with bovine subclinical mastitis in this area, necessitating additional epidemiological research that includes healthy matched controls. Full article
(This article belongs to the Special Issue Bacterial Infections and Antimicrobial Resistance in Animal Populations)
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18 pages, 3226 KB  
Article
Isolation, Identification, and Antibiotic Resistance, CRISPR System Analysis of Escherichia coli from Forest Musk Deer in Western China
by Kaiwei Yang, Xi Wu, Hui Ding, Bingcun Ma, Zengting Li, Yin Wang, Zexiao Yang, Xueping Yao and Yan Luo
Microorganisms 2025, 13(7), 1683; https://doi.org/10.3390/microorganisms13071683 - 17 Jul 2025
Cited by 2 | Viewed by 1461
Abstract
Escherichia coli (E. coli) is an opportunistic pathogen widely distributed in nature, and multi-drug resistance (MDR) E. coli has been widely recognized as a critical reservoir of resistance genes, posing severe health threats to humans and animals. A total of 288 [...] Read more.
Escherichia coli (E. coli) is an opportunistic pathogen widely distributed in nature, and multi-drug resistance (MDR) E. coli has been widely recognized as a critical reservoir of resistance genes, posing severe health threats to humans and animals. A total of 288 E. coli strains were isolated and purified from fresh fecal samples of forest musk deer collected from farms in Sichuan, Shaanxi, and Yunnan Provinces of China between 2013 and 2023. This study aimed to conduct antibiotic susceptibility testing and resistance gene detection on the isolated forest musk deer-derived E. coli, analyze the correlations between them, investigate the presence of CRISPR systems within the strains, and perform bioinformatics analysis on the CRISPR systems carried by the strains. Results showed that 138 out of 288 E. coli strains were MDR, with the highest resistance to tetracycline (48.3%), cefalexin (45.1%), and doxycycline (41.7%). Prevalent genes were tetA (41.0%), sul2 (30.2%), blaTEM (27.1%), with 29 gene–phenotype pairs correlated. CRISPR system-negative strains had higher resistance rates to 16 antibiotics and lower detection rates only for aac (6′)-Ib-cr, qnrA, and qnrB compared to CRISPR system-positive strains. Regional analysis showed that the problem of drug resistance in Sichuan and Shaanxi was more serious, and that the detection rate of antibiotic resistance genes was relatively high. This study guides E. coli infection control in forest musk deer and enriches resistance research data. Full article
(This article belongs to the Special Issue Bacterial Infections and Antimicrobial Resistance in Animal Populations)
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Review

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15 pages, 627 KB  
Review
Zoonotic Risks of Proteus mirabilis: Detection, Pathogenicity, and Antibiotic Resistance in Animals and Animal-Derived Foods
by Xiao-Li Liu, Si-Yi Wu and Zhongjia Yu
Microorganisms 2025, 13(9), 2060; https://doi.org/10.3390/microorganisms13092060 - 4 Sep 2025
Cited by 5 | Viewed by 3211
Abstract
Proteus mirabilis is a major uropathogen with growing concern over its presence in animal products and the associated zoonotic transmission risks. As a gut commensal in both humans and animals, it is increasingly detected in wild, farm, and companion animals, as well as [...] Read more.
Proteus mirabilis is a major uropathogen with growing concern over its presence in animal products and the associated zoonotic transmission risks. As a gut commensal in both humans and animals, it is increasingly detected in wild, farm, and companion animals, as well as in animal-derived foods and related environments. This review summarizes current evidence on its distribution across these sources and explores potential transmission routes to humans. Special attention is given to reported genomic similarities and shared antibiotic resistance patterns between animal and human isolates. The role of P. mirabilis in exacerbating intestinal inflammation further highlights its relevance beyond urinary infections. By revealing the epidemiology, pathogenic traits, and resistance profiles of animal-associated isolates, this review underscores the zoonotic potential of P. mirabilis and emphasizes the need for enhanced surveillance and research from a One Health perspective. Full article
(This article belongs to the Special Issue Bacterial Infections and Antimicrobial Resistance in Animal Populations)
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