Microbial drug resistance最新文献

{"title":"<i>Letter:</i> Complete Genome Sequence of <i>Klebsiella pneumoniae</i> ST15 Carrying <i>bla</i>_NDM-1 and <i>bla</i>_CTX-M-15 from Botswana, Africa.","authors":"Gherard Batisti Biffignandi, Giacomo Maria Paganotti, Pearl Ntshonga, Jonathan P Strysko, Paolo Gaibani","doi":"10.1177/10766294251364752","DOIUrl":"10.1177/10766294251364752","url":null,"abstract":"","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"300-301"},"PeriodicalIF":1.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144732350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbapenem-Resistant Enterobacterales in Indian ICU Patients: Molecular Insights, Risk Factors, and Clinical Impact.","authors":"Mukesh Kumar Patwa, Sheetal Verma, Vimala Venkatesh, Saurabh Kashyap, Mohit, Zia Arshad","doi":"10.1177/10766294251366395","DOIUrl":"10.1177/10766294251366395","url":null,"abstract":"<p><p>Carbapenem-resistant Enterobacterales (CRE) pose a critical threat in intensive care units (ICUs) due to rapid transmission potential and limited treatment options. The study aimed to determine the incidence of intestinal CRE colonization among ICU patients, characterize the isolates phenotypically and genotypically and identify associated risk factors. This cross-sectional study was conducted in a tertiary care hospital in North India and included 236 ICU patients. Clinical, demographic, lifestyle, and dietary data were collected through standardizedv questionnaires and medical records. CRE isolates were identified using standard microbiological techniques and characterized for resistance genes. CRE colonization was detected in 69.07% of patients. <i>Escherichia coli</i> (74.15%) and <i>Klebsiella pneumoniae</i> (21.61%) were the predominant species, with a significant rise in <i>K. pneumoniae</i> colonization during ICU stays (<i>p</i> = 0.049), suggesting nosocomial transmission. Asthma emerged as a novel independent risk factor (<i>p</i> = 0.023, 100% colonization). Other significant associations included non-vegetarian diet (<i>p</i> = 0.02), prolonged ICU stay (<i>p</i> = 0.010), and prior broad-spectrum antibiotic use (<i>p</i> = 0.028). Molecular analysis showed 84% of CRE isolates harbored the bla_NDM-1 gene, while bla_IMP was absent. CRE colonization was significantly associated with higher mortality (38.0% vs. 23.3%, <i>p</i> = 0.026). The study reveals a high prevalence of intestinal CRE colonization among ICU patients and highlights key modifiable risk factors and regional resistance patterns. Routine rectal screening, stringent infection control, and robust antimicrobial stewardship are urgently needed to limit CRE spread. A deeper understanding of colonization dynamics is essential to improving outcomes in critically ill patients.</p>","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"279-286"},"PeriodicalIF":1.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144817060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sulfamethoxazole-Trimethoprim Resistance in <i>Haemophilus influenzae</i> Clinical Isolates in Japan: Role of FolA and Horizontal Transfer.","authors":"Takeaki Wajima, Tomokazu Ando, Emi Tanaka, Kei-Ichi Uchiya","doi":"10.1089/mdr.2025.0013","DOIUrl":"10.1089/mdr.2025.0013","url":null,"abstract":"<p><p>Sulfamethoxazole-trimethoprim (SXT) is an important empirical treatment agent against various bacterial infections. In this study, we aimed to elucidate the mechanisms underlying SXT resistance in <i>Haemophilus influenzae</i> clinical isolates from Japan, as information on such resistance remains limited. A total of 79 <i>H. influenzae</i> clinical isolates collected in 2018 and 2022 were analyzed. The SXT resistance rates were 38.7% in 2018 and 35.3% in 2022. Multilocus sequence typing analysis revealed that ST422 was the most common sequence type (36.7%), followed by ST107 (26.7%). Horizontal transfer assays using the genomic DNA or PCR-amplified fragments revealed that SXT resistance was transferred to the susceptible isolates via genomic DNA and PCR-amplified <i>folA</i> fragments, indicating that FolA mediates SXT resistance in <i>H. influenzae</i>. Site-directed mutagenesis revealed that the substitution of isoleucine at position 95 in FolA was associated with SXT resistance. All SXT-resistant isolates had an amino acid substitution at position 95 in FolA: leucine in 26 of the 30 strains, valine in 3 strains, and glycine in 1 strain. Our findings demonstrate that SXT resistance in <i>H. influenzae</i> was prevalent and can spread via horizontal transfer. Furthermore, an amino acid substitution at position 95 of FolA played a key role in conferring resistance.</p>","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"262-267"},"PeriodicalIF":1.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144475975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mupirocin: A Useful Antibiotic for Methicillin-Resistant <i>Staphylococcus aureus</i> Decolonization: A Narrative Review.","authors":"Yasin Saberi, Kasra Javadi, Arezoo Mirzaei, Mehrdad Halaji","doi":"10.1177/10766294251358764","DOIUrl":"10.1177/10766294251358764","url":null,"abstract":"<p><p>Mupirocin (MUP) is a topical antibiotic derived from <i>Pseudomonas fluorescens</i>, widely used for the treatment of superficial skin infections and decolonization of methicillin-resistant <i>Staphylococcus aureus</i> (MRSA). Its unique mechanism of action, selective inhibition of bacterial isoleucyl-transfer RNA synthetase, confers high specificity with minimal risk of cross-resistance to other antibiotic classes. This narrative review provides an updated overview of MUP's chemical structure, mechanism of action, clinical efficacy, resistance mechanisms, and global resistance trends based on literature published from 2017 to 2024. Recent clinical studies confirm MUP's continued effectiveness, particularly in the decolonization of MRSA nasal infections. However, resistance, including high-level MUP resistance mediated by the <i>mupA</i> and <i>mupB</i> genes, is increasingly reported worldwide. A better understanding of resistance patterns and judicious use of MUP is essential to preserving its clinical utility in the context of rising antimicrobial resistance.</p>","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"250-261"},"PeriodicalIF":1.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144619079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genetic Diversity of <i>Stenotrophomonas</i> spp. and Its Impact on Diagnosis and Treatment of Pediatric Infections.","authors":"Luiza Souza Rodrigues, Hemanoel Passarelli-Araujo, Danieli Conte, Thaís Muniz Vasconscelos, Damaris Krul, Gabriela Uessugui, Beatriz Nayra Dias de Andrade, Adriele Celine Siqueira, Érika Medeiros Dos Santos, Marinei Campos Ricieri, Fábio de Araújo Motta, Libera Maria Dalla-Costa","doi":"10.1177/10766294251359795","DOIUrl":"10.1177/10766294251359795","url":null,"abstract":"<p><p><i>Stenotrophomonas maltophilia</i> is an opportunistic, multidrug-resistant pathogen emerging in pediatric infections. Its intrinsic resistance to multiple antibiotics and genetic diversity complicates both the identification of this species and treatment strategies. We conducted genomic and phenotypic analyses of isolates of <i>Stenotrophomonas</i> spp. from pediatric patients to assess species diversity through multilocus sequence typing and average nucleotide identity analyses. Antimicrobial susceptibility and resistance mechanisms, particularly the <i>sul1</i> gene linked to sulfonamide resistance, were investigated. Our findings revealed multiple genomospecies. Of the isolates initially identified as <i>S. maltophilia</i> using matrix-assisted laser desorption ionization-time-of-flight mass spectrometry, only 58.5% were identified as such through molecular analyses. These other <i>Stenotrophomonas</i> species may not be standardized for antimicrobial susceptibility testing by the Clinical and Laboratory Standards Institute and the European Committee on Antimicrobial Susceptibility and Testing. The <i>sul1</i> gene, carried on a mobilized class 1 integron, emerged as the primary driver of trimethoprim-sulfamethoxazole resistance, raising concerns about the rapid dissemination of resistance traits. Our findings underscore the diagnostic and therapeutic challenges posed by <i>Stenotrophomonas</i> spp. infections, highlighting the urgent need for enhanced molecular diagnostics for accurate species identification and resistance profiling. Continuous surveillance and updates to clinical guidelines are essential for improving infection management in pediatric patients.</p>","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"241-249"},"PeriodicalIF":1.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144626625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carriage of Extended Spectrum Beta-Lactamase and Carbapenemase Genes in Food Animals and Their Human Handlers: A One Health Perspective in a Low-Resource Setting in Africa.","authors":"Sarah Saidu, Akua Obeng Forson, Cornelia Appiah-Kwarteng, Daniel Oduro-Mensah, Michael Olu-Taiwo, Marjorie Ntiwaa Quarchie, Mary-Magdalene Osei, Paul Kwao, Noah Obeng-Nkrumah","doi":"10.1177/10766294251360947","DOIUrl":"10.1177/10766294251360947","url":null,"abstract":"<p><p>We investigated fecal colonization with third-generation cephalosporin-resistant (3GC-r) Enterobacterales and carbapenem-resistant Enterobacterales among food animals and their handlers in Ghana. A total of 252 fecal samples were collected from 211 animals and 41 human handlers across 20 farms between May and August 2023. Enterobacterales were isolated using standard methods and identified using Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry fingerprints and 16SrRNA sequencing. Antibiotic susceptibility testing was done using standard methods. Extended spectrum beta-lactamase (ESBL) and carbapenemase genes were identified by PCR and sequencing. A total of 264 Enterobacterales were isolated, comprising 44 from human handlers and 220 from food animals. Among human isolates, 31 (70.5%) were 3GC-r, with 9 (20.5%) expressing the ESBL phenotype and 2 (4.5%) producing carbapenemases. The most common ESBL genes detected were <i>bla</i>_CTX-M-15 (<i>n</i> = 5/9) and <i>bla</i>_CTX-M-14 (<i>n</i> = 2/9), while carbapenemase-producing isolates harbored <i>bla</i>_NDM-1 (<i>n</i> = 1/2) or <i>bla</i>_IMP-1 (<i>n</i> = 1/2). In food animals, 94 (42.7%) of Enterobacterales isolates were 3GC-r, with 11 (5.0%) carrying ESBL genes, predominantly <i>bla</i>_CTX-M-15 (<i>n</i> = 5/11). One <i>E. coli</i> isolate exhibited carbapenemase production (<i>bla</i>_NDM-1) with an ESBL gene (<i>bla</i>_CTX-M-1). Meropenem was the most effective antibiotic agent against the study isolates (≤5% resistance). Concordance of isolate/resistance gene combinations was observed at three farms where at least one human handler and at least one farm animal carried the same 3GC-r <i>Escherichia coli</i> with the same resistance genes, including <i>bla</i>_CTX-M-15, <i>bla</i>_TEM-10, and <i>bla</i>_NDM-1. The findings indicate a potential for zoonotic transmission of resistance genes between food animals and their human handlers.</p>","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"231-240"},"PeriodicalIF":1.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144675288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genetic Contexts of Plasmid- and Chromosome-Mediated <i>bla</i>_CTX-M-32 in <i>Escherichia coli</i> from Pigs and Poultry in the Western Region of Cuba.","authors":"Yanet Lopez-Dorta, Javier E Fernandez, Rosa Elena Hernández-Fillor, Michel Baez, Michael Brilhante, Patrick Butaye, Ivette Espinosa, Vincent Perreten","doi":"10.1089/mdr.2025.0027","DOIUrl":"10.1089/mdr.2025.0027","url":null,"abstract":"<p><p>Twenty-six genetically diverse <i>Escherichia coli</i> isolated from poultry and pigs in Cuba and harboring the extended-spectrum-β-lactamase (ESBL) gene <i>bla</i>_CTX-M-32 were sequenced using short- and long-read technologies to identify and characterize the ESBL-containing genetic elements, and their transferability was determined by conjugation. The <i>bla</i>_CTX-M-32 gene was located on plasmids in 15 <i>E. coli</i> (4 from pigs, 11 from poultry), on the chromosome in five porcine and four poultry <i>E. coli</i>, and on both the chromosome and plasmids in two poultry <i>E. coli</i> strains. The <i>bla</i>_CTX-M-32 plasmids of incompatibility groups IncF (<i>n</i> = 6) and IncX (<i>n</i> = 3) were detected in strains from chickens and pigs, and those of IncN (<i>n</i> = 4) and IncH (<i>n</i> = 4) were only present in poultry <i>E. coli</i>. The plasmids were conjugative except for the IncX1 and one of the IncFII and IncFIA plasmids that had truncations in the <i>tra</i> and <i>trh</i> regions. IS<i>Ec9</i>-IS<i>Kpn26</i>-<i>bla</i>_CTX-M-32-<i>wbuC</i> was the most common ESBL-carrying genetic context in both plasmids and chromosomes, and two other structures (IS<i>Kpn26</i>-<i>bla</i>_CTX-M-32-<i>wbuC,</i> IS<i>26</i>-<i>bla</i>_CTX-M-32-<i>wbuC</i>) were less frequent. This study provides new insights into the genetic backgrounds of <i>bla</i>_CTX-M-32 and its spread through plasmids between genetically different <i>E. coli</i> from different animals and geographically distant farms.</p>","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"219-230"},"PeriodicalIF":2.3,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144475974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic Antimicrobial Activity of Colistin and Amikacin with Zinc Oxide Nanoparticles and Their Posttranscriptional Regulation of <i>mcr-1</i> Gene Expression in Colistin-Resistant <i>Klebsiella pneumoniae</i>.","authors":"Jeevitha Ravi, Bhuvaneshwari Gunasekar, Jamith Basha","doi":"10.1089/mdr.2024.0117","DOIUrl":"10.1089/mdr.2024.0117","url":null,"abstract":"<p><p>The bacteria <i>Klebsiella pneumoniae</i> is encapsulated, rod-shaped, nonmotile, and Gram-negative bacilli. <i>K. pneumoniae</i> causes a variety of illnesses. They express various virulence factors such as capsules, which are primary virulence factors responsible for the pathogenicity and protection of bacteria from phagocytosis, lipopolysaccharide, which act as external membranes of the bacteria; and fimbriae-І and ІІІ which promote the binding to biological surfaces like medical devices such as ventilators. <i>K. pneumoniae</i>'s resistance to cephalosporins (3^rd and 4^th generation), quinolones, carbapenem, and colistin is increasing. Colistin is the last trait to treat multidrug-resistant <i>K. pneumoniae</i>. The monotherapy is becoming ineffective to treat infections. Plasmid-borne genes called <i>mcr-1</i> mediate colistin resistance, which is more prevalent. Colistin resistance and gene detection were done by using Epsilometry-test and conventional PCR, respectively. Amikacin was tested for synergism with colistin. Colistin with zinc oxide nanoparticle (NP) synergism was also tested. The properties of zinc oxide NPs are assessed by Fourier-transform infrared (FTIR), scanning electron microscope (SEM), and ultraviolet (UV) visible spectroscopy. Antibacterial activity of zinc oxide NPs was determined using the agar well diffusion method. In our study, we encourage combination drug therapy to treat the colistin-resistant <i>K. pneumoniae</i>. The synergistic activity of combined drugs was tested using checker-board technique. The results revealed that the synergistic activity of colistin combined with zinc oxide NPs and amikacin against colistin-resistant <i>K. pneumoniae</i> was found to be effective and can be further developed against the colistin resistant <i>K. pneumoniae</i>.</p>","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"201-210"},"PeriodicalIF":2.3,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144248767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"<i>In Vitro</i> Activity of Novel Antibiotics Against <i>Corynebacterium</i> spp. Clinical Isolates Responsible for Difficult-to-Treat Infections.","authors":"Ahmad Rami Bichali, Caroline Piau, Sophie Reissier, Maxime Lecourt, Anaïs Collet, Malo Penven, François Guérin, Vincent Cattoir","doi":"10.1089/mdr.2025.0046","DOIUrl":"10.1089/mdr.2025.0046","url":null,"abstract":"<p><p><i>Corynebacterium</i> species can be responsible for difficult-to-treat (DTT) infections, for which novel therapeutic options may be used. This study assessed the <i>in vitro</i> activity of newer antibiotics against <i>Corynebacterium</i> clinical isolates responsible for DTT infections between 2021 and 2023 in our center. Minimum inhibitory concentrations (MICs) were determined by the broth microdilution method or the gradient diffusion method. Interpretation was done according to the 2024 Comité de l'Antibiogramme de la Société Française de Microbiologie breakpoints. In total, 116 isolates were collected, including 73 (66%) responsible for bone and joint infections, among which half were device related. <i>C. striatum</i> was the most frequently isolated species. The activity of ceftaroline (MIC₉₀ >2 mg/L), ceftobiprole (MIC₉₀ >8 mg/L), and delafloxacin (MIC₉₀ >1 mg/L) was limited. By contrast, other molecules tested showed higher activity with low MIC₉₀ values: linezolid (MIC₉₀ ≤0.5 mg/L), tedizolid (MIC₉₀ = 0.12 mg/L), dalbavancin (MIC₉₀ = 0.12 mg/L), tigecycline (MIC₉₀ = 0.12 mg/L), eravacycline (MIC₉₀ = 0.06 mg/L), and omadacycline (MIC₉₀ = 0.5 mg/L). One <i>C. striatum</i> strain exhibited a high level of daptomycin resistance after antibiotic exposure (MIC >16 mg/L). The <i>in vitro</i> activity of most of these novel antibiotics is excellent against <i>Corynebacterium</i> clinical isolates. They could represent a real alternative for treating DTT infections due to <i>Corynebacterium</i> spp.</p>","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"211-218"},"PeriodicalIF":2.3,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144475973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Drug Resistance and Molecular Typing Characteristics of Diarrheagenic <i>Escherichia coli</i> in Patients with Diarrhea in Chifeng, China.","authors":"Chunru Wei, Yanbo Bai, Lingxian Li, Huying Li, Peng Peng, Yunyao Zhao, Xiujun Sun, Huixia Yu","doi":"10.1089/mdr.2025.0022","DOIUrl":"10.1089/mdr.2025.0022","url":null,"abstract":"<p><p>Diarrheagenic <i>Escherichia coli</i> (DEC) can cause diarrhea and other gastrointestinal diseases, leading to severe dehydration, malnutrition, and even death. The increasing drug resistance and the emergence of multidrug-resistant bacteria present significant challenges to the public health. This study employed qPCR detection, the broth microdilution method, and pulsed-field gel electrophoresis (PFGE) technology to analyze virulence gene, drug resistance, and phylogenetic relationships in DEC isolated from 1,000 stool samples of patients with diarrhea in Chifeng City from 2021 to 2024. A total of 96 strains of DEC were detected, yielding a detection rate of 9.6%. Among these, enteroaggregative <i>E. coli</i> (EAEC) comprised 72.9% (70 strains), enteropathogenic <i>E. coli</i> accounted for 26.0% (25 strains), and enterohemorrhagic <i>E. coli</i> constituted 1.1% (1 strain). The resistance rates of DEC to tetracycline (TET), ampicillin, nalidixic acid, sulfamethoxazole, and streptomycin were recorded at 60.4%, 57.3%, 51.0%, 49.0%, and 42.7%, respectively, with 51.1% of DEC strains exhibiting multidrug resistance. The PFGE banding patterns of the 96 DEC strains were highly polymorphic, with similarity coefficients ranging from 33.6% to 100.0%. Notably, a higher similarity coefficient indicated greater similarity in drug resistance phenotypes among the strains. These results indicate that the predominant type of DEC infection in patients with diarrhea in Chifeng City is EAEC, with a TET resistance rate as high as 60.4%. Furthermore, the resistance spectrum is broad, and the DNA level exhibits significant polymorphism.</p>","PeriodicalId":18701,"journal":{"name":"Microbial drug resistance","volume":" ","pages":"169-177"},"PeriodicalIF":2.3,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144003021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}