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Crettels L, Burlion N, Habets A, Taminiau B, Daube G, Delrée E, Mouchette AF, Thiry D. Exploring the presence, genomic traits, and pathogenic potential of extended-spectrum β-lactamase Escherichia coli in freshwater, wastewater, and hospital effluents. J Appl Microbiol 2024; 135:lxae144. [PMID: 38906843 DOI: 10.1093/jambio/lxae144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 05/30/2024] [Accepted: 06/20/2024] [Indexed: 06/23/2024]
Abstract
AIMS The purpose of this work was to study extended-spectrum β-lactamase (ESBL)-producing Escherichia coli (ESBL-EC) in freshwaters, hospital effluents, and wastewaters during two sampling campaigns in 2021. METHODS AND RESULTS Water sampling was performed at 24 stations in the Ourthe watershed in Belgium. A total of 644 ESBL (n = 642) and AmpC (n = 2) E. coli strains were isolated. Disk-diffusion assays were performed following the EUCAST's recommendations. All strains were tested for the presence of blaCTX-M-1, blaCTX-M-2, and blaCTX-M-9 gene groups by PCR. Genes belonging to blaCTX-M-1 and blaCTX-M-9 groups were detected, respectively, in 73.6% and 14.9% of the strains. No blaCTX-M-2 group's gene was found. A subset of strains (n = 40) was selected for whole genome sequencing. Escherichia coli serotype O18: H7 ST 1463 was predominant (n = 14) in the sequenced strains and showed pathogenicity in the Galleria mellonella larvae model. β-lactamase genes identified were blaCTX-M (n = 21), with blaCTX-M-15 mostly represented (n = 15), as well as blaTEM (n = 11), blaOXA (n = 7), blaSHV (n = 9), and carbapenemase (CP) genes were observed in several strains-blaKPC-3 (n = 19), blaNDM-1 (n = 1), blaVIM-1 (n = 2), and blaOXA-244 (n = 2)-even from freshwaters. CONCLUSIONS ESBL-EC are widely distributed in the aquatic environment in Belgium and contain a variety of ESBL and CP genes.
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Affiliation(s)
- Leslie Crettels
- Department of Microbiology, Scientific Institute of Public Service (ISSeP), 4000 Liège, Belgium
- Veterinary bacteriology and bacterial animal diseases, Department of Parasitic and Infectious Diseases, Fundamental and Applied Research for Animals and Health Centre (FARAH), Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - Nadine Burlion
- Department of Microbiology, Scientific Institute of Public Service (ISSeP), 4000 Liège, Belgium
| | - Audrey Habets
- Veterinary bacteriology and bacterial animal diseases, Department of Parasitic and Infectious Diseases, Fundamental and Applied Research for Animals and Health Centre (FARAH), Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - Bernard Taminiau
- Department of Food Sciences-Microbiology, Fundamental and Applied Research for Animals and Health Centre (FARAH), Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - Georges Daube
- Department of Food Sciences-Microbiology, Fundamental and Applied Research for Animals and Health Centre (FARAH), Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - Elisa Delrée
- Department of Microbiology, Scientific Institute of Public Service (ISSeP), 4000 Liège, Belgium
| | | | - Damien Thiry
- Veterinary bacteriology and bacterial animal diseases, Department of Parasitic and Infectious Diseases, Fundamental and Applied Research for Animals and Health Centre (FARAH), Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
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Prevalence of Extended-Spectrum β-Lactamase-Resistant Genes in Escherichia coli Isolates from Central China during 2016-2019. Animals (Basel) 2022; 12:ani12223191. [PMID: 36428418 PMCID: PMC9686871 DOI: 10.3390/ani12223191] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 11/04/2022] [Accepted: 11/15/2022] [Indexed: 11/19/2022] Open
Abstract
The emergence and dissemination of Escherichia coli (E. coli) strains that produce extended-spectrum beta-lactamases (ESBLs) represents a major public health threat. The present study was designed to evaluate the prevalence and characteristics of ESBL-producing Escherichia coli isolates from chickens in central China during 2016-2019. A total of 407 E. coli strains isolated from 581 chicken swabs were identified conventionally and analyzed for various cephalosporin susceptibility by disk-diffusion assay. ESBL-producing strains were screened using the double=disk synergy test and ESBL-encoding genes were carried out by PCR/sequencing. A total of 402 E. coli isolates exhibited strong resistance to first- to fourth-generation cephalosporins and monobactam antibiotics, especially cefazolin (60.69%), cefuroxime (54.05%), cefepime (35.14%), ceftriaxone (54.30%), and aztreonam (40.29%). Piperacillin/tazobactam (1.72%) was the most effective drug against the strains, but the resistance rates increased each year. Among the isolates, 262 were identified as ESBL producers and the isolation rates for the ESBL producers increased from 63.37% to 67.35% over the four years. CTX-M (97.33%) was the most prevalent type, followed by TEM (76.72%) and SHV (3.05%). The most common ESBL genotype combination was blaTEM + blaCTX-M (74.46%), in which the frequency of carriers increased steadily, followed by blaCTX-M + blaSHV (3.05%). In addition, the most predominant specific CTX-M subtypes were CTX-M-55 (48.47%) and CTX-M-1 (17.94%), followed by CTX-M-14 (11.01%), CTX-M-15 (8.02%), CTX-M-9 (6.11%), CTX-M-65 (4.58%), and CTX-M-3 (1.15%). Moreover, a novel multiplex qPCR assay was developed to detect blaCTX-M, blaTEM, and blaSHV, with limits of detection of 2.06 × 101 copies/μL, 1.10 × 101 copies/μL, and 1.86 × 101 copies/μL, respectively, and no cross-reactivity with other ESBL genes and avian pathogens. The assays exhibited 100% sensitivity and specificities of 85%, 100%, and 100% for blaCTX-M, blaTEM, and blaSHV, respectively. In conclusion, our findings indicated that ESBL-producing E.coli strains isolated from chickens in central China were highly resistant to cephalosporins and frequently harbored diversity in ESBL-encoding genes. These isolates can pose a significant public health risk. The novel multiplex qPCR method developed in this study may be a useful tool for molecular epidemiology and surveillance studies of ESBL genes.
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Hapuarachchi IU, Hannaway RF, Roman T, Biswas A, Dyet K, Morgan X, Ussher JE. Genetic evaluation of ESBL-producing Escherichia coli urinary isolates in Otago, New Zealand. JAC Antimicrob Resist 2021; 3:dlab147. [PMID: 34778763 PMCID: PMC8578626 DOI: 10.1093/jacamr/dlab147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 09/01/2021] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVES The incidence of infections with ESBL-producing Escherichia coli (ESBL-Ec) in New Zealand is increasing. ESBL-Ec most commonly cause urinary tract infections and are seen in both community and hospitalized patients. The reason for the increasing incidence of ESBL-Ec infections is unknown. METHODS In this study, 65 urinary ESBL-Ec isolates from the Otago region in 2015 were fully genetically characterized to understand the mechanisms of transmission. The ESBL gene, E. coli STs, plasmid types and genetic context (e.g. insertion sequences) of ESBL genes were determined by a combination of whole genome and plasmid sequencing. The phylogenetic relationships of the isolates were compared with ESBL-Ec isolates sequenced as part of the 2016 nationwide survey. RESULTS Significant diversity of E. coli strains, plasmids, and the genetic context of ESBL genes was seen. However, there was evidence of common mobile genetic elements in unrelated ESBL-Ec. CONCLUSIONS Multiple introductions of ESBL resistance genes or resistant bacterial strains with limited horizontal transmission of mobile genetic elements accounts for the increased incidence of ESBL-Ec in this low prevalence area. Future studies should investigate modes of transmission of ESBL-Ec in the Otago region.
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Affiliation(s)
- Isuri U Hapuarachchi
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - Rachel F Hannaway
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - Tabatha Roman
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - Ambarish Biswas
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
- AgResearch, Palmerston North, New Zealand
| | | | - Xochitl Morgan
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - James E Ussher
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
- Southern Community Laboratories, Dunedin, New Zealand
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High Prevalence of Antimicrobial Resistance Among Gram-Negative Isolated Bacilli in Intensive Care Units at a Tertiary-Care Hospital in Yucatán Mexico. ACTA ACUST UNITED AC 2019; 55:medicina55090588. [PMID: 31540314 PMCID: PMC6780114 DOI: 10.3390/medicina55090588] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 09/05/2019] [Accepted: 09/11/2019] [Indexed: 11/17/2022]
Abstract
Background and Objectives: Antimicrobial resistance (AMR) is increasing worldwide and imposes significant life-threatening risks to several different populations, especially to those in intensive care units (ICU). The most commonly isolated organisms in ICU comprise gram-negative bacilli (GNB), and these represent a leading cause of serious infections. This study was conducted to describe the prevalence of resistance in GNB isolated from patients in adults, pediatric, and neonatal ICU in a tertiary-care hospital in Mérida, Mexico. Materials and Methods: A retrospective study was done on samples collected in Neonatal (NICU), Pediatric (PICU) and Adult (AICU) ICU of Unidad Médica de Alta Especialidad, Instituto Mexicano del Seguro Social in Mérida, México. The identification of isolates and antimicrobial susceptibility testing were performed using an automated system. Results: A total of 517 GNB strains were isolated. The most common positive culture was bronchial secretions. Pseudomonas aeruginosa was the prevalent pathogen in NICU and PICU, whereas Escherichia coli was common in the AICU. Overall, GNB exhibited a high resistance rates for Ampicillin (95.85%), Cefuroxime (84.17%), Piperacillin (82.93%), Cefotaxime (78.07%), Ceftriaxone (77.41%), Aztreonam (75.23%), Cefazolin (75.00%), and Ceftazidime (73.19%). There are significant differences in the resistance rates of GNB from different ICUs for penicillins, cephalosporins, carbapenems and fluoroquinolones drugs. Escherichia coli (multidrug-resistant [MDR] = 91.57%, highly resistant microorganisms [HRMO] = 90.36%) and Acinetobacter baumannii (MDR = 86.79%, HRMO = 83.02%) exhibited the highest percentage of MDR and HRMO profiles. The prevalence of the extended-spectrum beta-lactamases (ESBL)-producing isolates was 83.13% in E. coli, 78.84% in Klebsiella pneumoniae, and 66.67% in Proteus mirabilis, respectively. Conclusions: The high resistance rates to drugs were exhibited by our GNB isolates. Continuous surveillance and control of the use of antimicrobials are urgently needed to reduce the emergence and spreading of MDR, HRMO, and/or ESBL-producing bacilli.
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Logan LK, Medernach RL, Domitrovic TN, Rispens JR, Hujer AM, Qureshi NK, Marshall SH, Nguyen DC, Rudin SD, Zheng X, Konda S, Weinstein RA, Bonomo RA. The Clinical and Molecular Epidemiology of CTX-M-9 Group Producing Enterobacteriaceae Infections in Children. Infect Dis Ther 2019; 8:243-254. [PMID: 30772921 PMCID: PMC6522575 DOI: 10.1007/s40121-019-0237-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Indexed: 01/13/2023] Open
Abstract
Introduction The pandemic of extended-spectrum beta-lactamase-(ESBL)-producing Enterobacteriaceae (Ent) is strongly linked to the dissemination of CTX-M-type-ESBL-Ent. We sought to define the epidemiology of infections in children due to an emerging resistance type, CTX-M-9-group-producing-Ent (CTX-M-9-grp-Ent). Methods A retrospective matched case-control analysis of children with CTX-M-9-grp-Ent infections who received medical care at three Chicago area hospitals was performed. Cases were defined as children possessing extended-spectrum cephalosporin-resistant (ESC-R) infections due to blaCTX-M-9. PCR and DNA analysis assessed beta-lactamase (bla) genes, multi-locus sequence types (MLST) and phylogenetic grouping of E. coli. Controls were children with ESC-susceptible (ESC-S)-Ent infections matched one case to three controls by age, source, and hospital. The clinical-epidemiologic predictors of CTX-M-9-grp-Ent infection were assessed. Results Of 356 ESC-R-Ent isolates from children (median age 4.1 years), the CTX-M-9-group was the solely detected bla gene in 44 (12.4%). The predominant species was E. coli (91%) of virulent phylogroups D (60%) and B2 (40%). MLST revealed multiple strain types. On multivariable analysis, CTX-M-9-grp-Ent occurred more often in E. coli than other Ent genera (OR 7.4, 95% CI 2.4, 27.2), children of non-Black-White-Hispanic race (OR 7.4, 95% CI 2.4, 28.2), and outpatients (OR 4.5, 95% CI 1.7, 12.3), which was a very unexpected finding for infections due to antibiotic-resistant bacteria. Residents of South Chicago had a 6.7 times higher odds of having CTX-M-9-grp-Ent infections than those in the reference region (West), while residence in Northwestern Chicago was associated with an 81% decreased odds of infection. Other demographic, comorbidity, invasive-device, and antibiotic use differences were not found. Conclusion CTX-M-9-grp-Ent infection may be associated with patient residence and is occurring in children without traditional in-patient exposure risk factors. This suggests that among children, the community environment may be a key contributor in the spread of these resistant pathogens.
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Affiliation(s)
- Latania K Logan
- Pediatrics, Rush University Medical Center, Rush Medical College, Chicago, IL, USA. .,Research Service, Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Cleveland, OH, USA. .,Cook County Health and Hospital Systems, Chicago, IL, USA.
| | - Rachel L Medernach
- Pediatrics, Rush University Medical Center, Rush Medical College, Chicago, IL, USA.,Medicine, Rush University Medical Center, Rush Medical College, Chicago, IL, USA
| | - T Nicholas Domitrovic
- Research Service, Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Cleveland, OH, USA.,Case Western Reserve School of Medicine, Cleveland, OH, USA
| | - Jared R Rispens
- Pediatrics, Rush University Medical Center, Rush Medical College, Chicago, IL, USA.,Medicine, Rush University Medical Center, Rush Medical College, Chicago, IL, USA
| | - Andrea M Hujer
- Research Service, Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Cleveland, OH, USA.,Case Western Reserve School of Medicine, Cleveland, OH, USA
| | - Nadia K Qureshi
- Pediatrics, Loyola University Medical Center, Maywood, IL, USA
| | - Steven H Marshall
- Research Service, Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Cleveland, OH, USA
| | - David C Nguyen
- Pediatrics, Rush University Medical Center, Rush Medical College, Chicago, IL, USA.,Case Western Reserve School of Medicine, Cleveland, OH, USA.,Medicine, Rush University Medical Center, Rush Medical College, Chicago, IL, USA
| | - Susan D Rudin
- Research Service, Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Xiaotian Zheng
- Microbiology, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA.,Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Sreenivas Konda
- Epidemiology and Biostatistics, University of Illinois at Chicago, Chicago, IL, USA
| | - Robert A Weinstein
- Medicine, Rush University Medical Center, Rush Medical College, Chicago, IL, USA.,Cook County Health and Hospital Systems, Chicago, IL, USA
| | - Robert A Bonomo
- Research Service, Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Cleveland, OH, USA.,Case Western Reserve School of Medicine, Cleveland, OH, USA.,Pharmacology, Case Western Reserve University School of Medicine, and the CWRU-Cleveland VAMC Center for Antimicrobial Resistance and Epidemiology (Case VA CARES), Cleveland, OH, USA.,Molecular Biology and Microbiology, Case Western Reserve University School of Medicine, and the CWRU-Cleveland VAMC Center for Antimicrobial Resistance and Epidemiology (Case VA CARES), Cleveland, OH, USA.,Biochemistry, Case Western Reserve University School of Medicine, and the CWRU-Cleveland VAMC Center for Antimicrobial Resistance and Epidemiology (Case VA CARES), Cleveland, OH, USA.,Proteomics and Bioinformatics, Case Western Reserve University School of Medicine, and the CWRU-Cleveland VAMC Center for Antimicrobial Resistance and Epidemiology (Case VA CARES), Cleveland, OH, USA
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Ramírez-Castillo FY, Moreno-Flores AC, Avelar-González FJ, Márquez-Díaz F, Harel J, Guerrero-Barrera AL. An evaluation of multidrug-resistant Escherichia coli isolates in urinary tract infections from Aguascalientes, Mexico: cross-sectional study. Ann Clin Microbiol Antimicrob 2018; 17:34. [PMID: 30041652 PMCID: PMC6057003 DOI: 10.1186/s12941-018-0286-5] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 07/14/2018] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Uropathogenic Escherichia coli (UPEC) are one of the main bacteria causing urinary tract infections (UTIs). The rates of UPEC with high resistance towards antibiotics and multidrug-resistant bacteria have increased dramatically in recent years and could difficult the treatment. METHODS The aim of the study was to determine multidrug-resistant bacteria, antibiotic resistance profile, virulence traits, and genetic background of 110 E. coli isolated from community (79 isolates) and hospital-acquired (31 isolates) urinary tract infections. The plasmid-mediated quinolone resistance genes presence was also investigated. A subset of 18 isolates with a quinolone-resistance phenotype was examined for common virulence genes encoded in diarrheagenic and extra-intestinal pathogenic E. coli by a specific E. coli microarray. RESULTS Female children were the group most affected by UTIs, which were mainly community-acquired. Resistance to trimethoprim-sulfamethoxazole, ampicillin, and ampicillin-sulbactam was most prevalent. A frequent occurrence of resistance toward ciprofloxacin (47.3%), levofloxacin (43.6%) and cephalosporins (27.6%) was observed. In addition, 63% of the strains were multidrug-resistant (MDR). Almost all the fluoroquinolone (FQ)-resistant strains showed MDR-phenotype. Isolates from male patients were associated to FQ-resistant and MDR-phenotype. Moreover, hospital-acquired infections were correlated to third generation cephalosporin and nitrofurantoin resistance and the presence of kpsMTII gene. Overall, fimH (71.8%) and fyuA (68.2%), had the highest prevalence as virulence genes among isolates. However, the profile of virulence genes displayed a great diversity, which included the presence of genes related to diarrheagenic E. coli. Out of 110 isolates, 25 isolates (22.7%) were positive to qnrA, 23 (20.9%) to qnrB, 7 (6.4%) to qnrS1, 7 (6.4%) to aac(6')lb-cr, 5 (4.5%) to qnrD, and 1 (0.9%) to qnrC genes. A total of 12.7% of the isolates harbored blaCTX-M genes, with blaCTX-M-15 being the most prevalent. CONCLUSIONS Urinary tract infection due to E. coli may be difficult to treat empirically due to high resistance to commonly used antibiotics. Continuous surveillance of multidrug resistant organisms and patterns of drug resistance are needed in order to prevent treatment failure and reduce selective pressure. These findings may help choosing more suitable treatments of UTI patients in this region of Mexico.
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Affiliation(s)
- Flor Y. Ramírez-Castillo
- Laboratorio de Biología Celular y Tisular, Departamento de Morfología, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Col. Cd. Universitaria, 20131 Aguascalientes, Mexico
| | - Adriana C. Moreno-Flores
- Laboratorio de Biología Celular y Tisular, Departamento de Morfología, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Col. Cd. Universitaria, 20131 Aguascalientes, Mexico
| | - Francisco J. Avelar-González
- Laboratorio de Ciencias Ambientales, Departamento de Fisiología y Farmacología, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Col. Cd. Universitaria, 20131 Aguascalientes, Mexico
| | - Francisco Márquez-Díaz
- Departamento de Infectología, Centenario Hospital Miguel Hidalgo, Galeana Sur 495, Obraje, 20000 Aguascalientes, Mexico
| | - Josée Harel
- Département de pathologie et microbiologie, Centre de Recherche en Infectologíe Porcine et Aviaire, Faculté de Médecine Vétérinaire, Université de Montréal, 3200, rue Sicott, Saint-Hyacinthe, Montreal, QC J2S 2M2 Canada
| | - Alma L. Guerrero-Barrera
- Laboratorio de Biología Celular y Tisular, Departamento de Morfología, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Col. Cd. Universitaria, 20131 Aguascalientes, Mexico
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Rapid in vitro detection of CTX-M groups 1, 2, 8, 9 resistance genes by LAMP assays. PLoS One 2018; 13:e0200421. [PMID: 30021007 PMCID: PMC6051616 DOI: 10.1371/journal.pone.0200421] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 06/26/2018] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND The prevalence of bacteria producing CTX-M Extended-Spectrum β-lactamases (ESBLs) has increased around the world and some of them became a major cause of infections such as bloodstream or urinary tract infections (UTI). We developed a loop-mediated isothermal amplification (LAMP) assay for a simple, rapid and sensitive detection of the four most common CTX-M groups, namely CTX-M groups 1, 2, 8 and 9. METHODS LAMP primers targeting the four ESBLs CTX-M groups were designed using the Primer Explorer V4 software. The detection limit of the method was tested by serial dilution of reference DNAs. The primer specificity of the LAMP reaction was tested on DNA extracted from six strains producing various group of CTX-M and validated using DNA extracted from CTX-M-resistant clinical isolates (isolated from pus, urine, or blood). Results were compared with those of conventional PCR. RESULTS We were able to detect down to 0.1 pg/ul of DNA using the newly developed LAMP assays whereas the minimal amount detectable for conventional PCR was 50 to 100pg/ul, indicating that the LAMP assay was found to have a detection limit at least 500 to 1000 times lower than the PCR. Additionally, representative genes from the CTX-M groups 1, 2, 8 and 9 were amplified using the designed assay and no cross amplification was observed between the four CTX-M groups, demonstrating the specificity of the LAMP assay. Of the 37 clinical strains tested, the four LAMP assays showed 100% sensitivity and 87%, 97%, 100%, 100% specificity for the CTX-M groups 1, 2, 8 and 9 respectively. CONCLUSION Being sensitive, specific, rapid and standard methods, the LAMP assays developed in this study have a potential to be beneficial tools in molecular epidemiology and surveillance studies of the four prevalent EBSLs CTX-M groups even in low cost laboratory.
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Kim YJ, Moon JS, Oh DH, Chon JW, Song BR, Lim JS, Heo EJ, Park HJ, Wee SH, Sung K. Genotypic characterization of ESBL-producing E. coli from imported meat in South Korea. Food Res Int 2017; 107:158-164. [PMID: 29580473 DOI: 10.1016/j.foodres.2017.12.023] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 12/04/2017] [Accepted: 12/08/2017] [Indexed: 11/26/2022]
Abstract
Twenty extended-spectrum β-lactamase (ESBL)-producing E. coli strains were isolated from imported meat in South Korea. ESBL strains of E. coli were detected in chicken (14/20) more often than in pork (6/20) and beef (0/20); the highest number (12/20) was detected in Brazilian meats. The blaCTX-M genes were predominant in meats from many countries. E. coli from pork imported from France produced the blaCTX-M-58 enzyme, which has never been documented previously in ESBL-producing bacteria from clinical or environmental sources. Additionally, the coexistence of the blaCTX-M-2 and blaOXA-1 enzymes in EC12-5 isolate was found for the first time in an ESBL E. coli isolate. A rare blaCTX-M type, blaCTX-M-25, was found in 40% of ESBL E. coli isolates. Phenotypic susceptibility testing showed that E. coli isolates were resistant to up to eleven antibiotics, including ciprofloxacin. For the first time, a new combination in an integron gene cassette, aacA4-cmlA6-qacEΔ1, was found in an E. coli isolate from poultry imported from Brazil. Three E. coli ST117 isolates, from an avian pathogenic lineage producing CTX-M-94, harbored fimH, fyuA, iutA, papC, rfc, and traT virulence genes and were not susceptible to quinolones. For the first time, rfc and papG virulence factors were detected in ESBL E. coli strains isolated from meat products. Even though E. coli CC21 and CC22 were obtained from meats from the USA and Brazil, respectively, they had a similarity coefficient higher than 99% in rep-PCR and the same MLST type (ST117), phenotypic antibiotic resistance pattern, integron gene (qacEΔ1), and plasmid DNA profile. This study indicates that imported meat products may be a source of ESBL-producing E. coli strains in South Korea.
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Affiliation(s)
- Young-Jo Kim
- Ministry of Food and Drug Safety, Chungcheongbuk-do, Republic of Korea
| | - Jin-San Moon
- Animal and Plant Quarantine Agency, Gyeongsangbuk-do, Republic of Korea
| | - Deog-Hwan Oh
- Department of Food Science and Biotechnology, Kangwon National University, Chuncheon, Republic of Korea
| | - Jung-Whan Chon
- Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR, USA
| | - Bo-Ra Song
- Ministry of Food and Drug Safety, Chungcheongbuk-do, Republic of Korea
| | - Jong-Su Lim
- Animal and Plant Quarantine Agency, Gyeongsangbuk-do, Republic of Korea
| | - Eun-Jeong Heo
- Ministry of Food and Drug Safety, Chungcheongbuk-do, Republic of Korea
| | - Hyun-Jung Park
- Ministry of Food and Drug Safety, Chungcheongbuk-do, Republic of Korea
| | - Sung-Hwan Wee
- Animal and Plant Quarantine Agency, Gyeongsangbuk-do, Republic of Korea
| | - Kidon Sung
- Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR, USA.
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