Urogenital Tract Infection

Molecular Mechanisms of Antibiotic Resistance in Uropathogenic Escherichia coli: A Narrative Review: Nakjun Choi, Dong Uk Kim, Eun-Jin Lee; Urogenit Tract Infect 2025;20(2):96-106. Published online August 31, 2025; DOI: https://doi.org/10.14777/uti.2550018009

Urinary tract infections (UTIs) are among the most prevalent bacterial infections worldwide, with uropathogenic Escherichia coli (UPEC) serving as the primary causative agent. Although antibiotic therapy remains the standard of care for UTI treatment, the increasing prevalence of antimicrobial resistance has substantially reduced the effectiveness of commonly prescribed antibiotics. Resistance to trimethoprim-sulfamethoxazole (TMP-SMX), β-lactams, and fluoroquinolones is particularly concerning, as these agents constitute the principal therapeutic options for UTIs. This review examines the molecular mechanisms underlying UPEC resistance to these three classes of antibiotics, including target site modifications, efflux pump overexpression, porin regulation, and enzymatic degradation. Furthermore, it explores how these resistance determinants contribute to the development of multidrug-resistant (MDR) UPEC strains, which demonstrate cross-resistance to multiple antibiotics and present significant challenges for clinical management. Novel therapeutic strategies, such as efflux pump inhibitors, bacteriophage therapy, and genomic-guided precision medicine, are under investigation as potential solutions to address the growing global burden of MDR UPEC, alongside alternative non-antibiotic treatments. This review aims to provide a comprehensive overview of the genetic and regulatory pathways driving antibiotic resistance in UPEC, offering insights that may guide the development of effective treatment strategies and help mitigate the ongoing spread of antimicrobial resistance.

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Editorial for Urogenital Tract Infection (UTI) 2025 Vol. 20 No. 2 – Highlights of This Issue’s Papers and the UTI Editors’ Pick
Koo Han Yoo
Urogenital Tract Infection.2025; 20(2): 55. CrossRef

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Beta-Lactamase-Mediated Antibiotic Resistance in Urinary Tract Infections: Mechanisms and Therapeutic Strategies: Fanglin Shao, Dengxiong Li, Jie Wang, Zhouting Tuo, Zhipeng Wang, Wuran Wei, Ruicheng Wu, Dechao Feng; Urogenit Tract Infect 2025;20(2):67-81. Published online August 31, 2025; DOI: https://doi.org/10.14777/uti.2550012006

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Urinary tract infections (UTIs) are among the most prevalent bacterial infections globally, and are primarily caused by Escherichia and Klebsiella. The overprescription and inappropriate use of antibiotics have accelerated the emergence of multidrug-resistant bacteria. Beta-lactamases play a critical role in mediating antibiotic resistance in UTIs. These enzymes promote bacterial resistance through multiple mechanisms, including gene mutation, plasmid-mediated horizontal gene transfer, and the involvement of integrons. Comprehensive knowledge of the ways in which beta-lactamases contribute to resistance in UTIs is essential for improving treatment strategies. Advances in detection technologies, such as gene sequencing and mass spectrometry, have greatly enhanced the ability to monitor and predict bacterial resistance. Current therapeutic strategies include the application of beta-lactamase inhibitors, the development of novel antibiotics, and alternative treatments that have shown efficacy against beta-lactamase-mediated antibiotic resistance. This paper reviews the mechanisms of beta-lactamase-mediated resistance in UTIs and provides an in-depth overview of several detection methods and therapeutic approaches.

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Editorial for Urogenital Tract Infection (UTI) 2025 Vol. 20 No. 2 – Highlights of This Issue’s Papers and the UTI Editors’ Pick
Koo Han Yoo
Urogenital Tract Infection.2025; 20(2): 55. CrossRef

226 View
12 Download
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Fournier’s Gangrene: A 10-Year Clinical Experience at a Tertiary Academic Medical Center: Woo Seop Seong, Byeong Jin Kang, A Reum Kim, Kyung Hwan Kim, Hong Koo Ha; Urogenit Tract Infect 2023;18(2):64-69. Published online August 31, 2023; DOI: https://doi.org/10.14777/uti.2023.18.2.64

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Purpose: This retrospective study examined the factors influencing clinical outcomes and mortality in patients with Fournier's Gangrene (FG). The medical history, diagnostic procedures, treatment approaches, complications, and mortality factors associated with FG were analyzed.
Materials and Methods: This study retrospectively analyzed the medical records of 40 patients with FG treated over 10 years. The collected data included the patient demographics, comorbidities, vital signs, laboratory tests, Fournier’s Gangrene Severity Index (FGSI) scores, wound swab culture results, treatment approaches, and length of hospitalization.
Results: Among the patients with FG, diabetes mellitus and hypertension were the most common comorbidities. The hemodialysis dependence has been identified as a significant risk factor of mortality. In addition, septic shock and an FGSI >9 were associated with increased mortality. Escherichia coli was the most prevalent bacterium in wound swab cultures, and the presence of antibiotic-resistant bacteria was significantly higher in the non-survivors. Treatment involved broad-spectrum antibiotics, emergency surgical debridement, and subsequent adjustments based on culture results.
Conclusions: Early diagnosis and prompt initiation of treatment are essential for improving the outcomes of patients with FG. Hemodialysis dependency, septic shock, FGSI scores, and the presence of antibiotic-resistant bacteria are important factors associated with mortality in patients with FG. Further research will be needed to validate these findings and explore adjunctive therapies to enhance the patient outcomes and improve FG management.

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Prognostic factors and clinical outcomes in Fournier’s Gangrene: a retrospective study of 35 patients
Han Bee Hong, Jeong Woo Lee, Chan Hee Park
BMC Infectious Diseases.2024;[Epub] CrossRef

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