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Tsai YY, Ienes Lima J, Alvarez Narvaez S, Logue CM. Whole-genome analysis of five Escherichia coli strains isolated from focal duodenal necrosis in laying hens reveals genetic similarities to the E. coli O25:H4 ST131 strain. Microbiol Spectr 2025; 13:e0211024. [PMID: 40162772 PMCID: PMC12054123 DOI: 10.1128/spectrum.02110-24] [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: 08/23/2024] [Accepted: 03/10/2025] [Indexed: 04/02/2025] Open
Abstract
Focal duodenal necrosis (FDN) is an intestinal disease causing significant economic losses in the table-egg industry due to reduced egg production in laying hens. Its etiology and pathogenesis remain poorly understood. Between 2021 and 2023, 111 Escherichia coli isolates were collected from FDN lesions and screened for the presence of virulence genes using PCR panels. Five strains-FDN-4, FDN-9, FDN-11, FDN-24, and FDN-50-were selected for whole-genome sequencing due to their high virulence gene content. Core-genome analyses found that the five FDN E. coli belong to different phylogroups and strain types (ST), but they all share multiple complete operons involved in key pathogenic functions, including host cell adhesion and invasion, iron acquisition, motility, biofilm formation, and acid resistance. Comparative genomic analyses identified FDN-4 as the most genetically distinct strain, closely resembling EC958, an O25b:H4 ST131 uropathogenic E. coli (UPEC) commonly associated with extended-spectrum beta-lactamase production. FDN-4 and EC958 share unique chromosomal virulence genes absent in the other FDN strains, all located within genomic islands. This study provides the first complete genomic characterization of E. coli isolated from FDN lesions and highlights FDN-4 as a genetically distinct strain with similarities to O25b:H4 ST131 UPEC.IMPORTANCEThis study presents the first complete genomic characterization of Escherichia coli isolated from focal duodenal necrosis (FDN) lesions. Notably, FDN-4 is the first E. coli strain from a poultry disease (FDN) to show significant similarity to O25b:H4 ST131 strains, commonly classified as uropathogenic E. coli and often associated with extended-spectrum beta-lactamase production. However, caution is warranted when attributing direct transmission routes between poultry and humans.
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Affiliation(s)
- Yu-Yang Tsai
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - Julia Ienes Lima
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - Sonsiray Alvarez Narvaez
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - Catherine M. Logue
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
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Elabbasy MT, El Bayomi RM, Abdelkarim EA, Hafez AESE, Othman MS, Ghoniem ME, Samak MA, Alshammari MH, Almarshadi FA, Elsamahy T, Hussein MA. Antibacterial and Antibiofilm Activity of Green-Synthesized Zinc Oxide Nanoparticles Against Multidrug-Resistant Escherichia coli Isolated from Retail Fish. Molecules 2025; 30:768. [PMID: 40005080 PMCID: PMC11858201 DOI: 10.3390/molecules30040768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2025] [Revised: 02/01/2025] [Accepted: 02/04/2025] [Indexed: 02/27/2025] Open
Abstract
Multidrug-resistant (MDR) Escherichia coli is a major foodborne pathogen posing a critical threat to public health, particularly through the contamination of animal products. The increasing prevalence and virulence of MDR E. coli strains underscore the urgent need for alternative antimicrobial strategies. This study aimed to synthesize and characterize zinc oxide nanoparticles (ZnO-NPs) using Stevia rebaudiana as a sustainable capping and reducing agent, aligning with green chemistry principles. Of the 120 fish samples, 74.2% (89/120) were positive for E. coli contamination. Among the identified E. coli strains, 77.8% (119/153) were classified as MDR. Resistance profiling revealed 22 distinct patterns, and seven highly resistant and virulent strains were selected for further analyses. The eco-friendly auto-combustion synthesis of ZnO-NPs produced nanoparticles with semi-spherical to hexagonal shapes and an average size ranging from 12 to 25 nm. Scanning Electron Microscope-Energy Dispersive X-ray analysis (SEM-EDS) confirms that ZnO-NPs primarily consist of zinc (37.5%) and oxygen (19.9%), with carbon (42.6%) indicating the green synthesis process. ZnO-NPs demonstrated potent, dose-dependent antibacterial and antibiofilm activity against the selected MDR E. coli strains. Additionally, mechanistic studies revealed that ZnO-NPs disrupt bacterial cell membranes, alter cellular morphology, and interfere with DNA integrity. These findings highlight the potential of eco-friendly ZnO-NPs as a promising nanomaterial for enhancing food safety and addressing the growing challenge of MDR foodborne bacteria.
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Affiliation(s)
- Mohamed Tharwat Elabbasy
- Department of Pathology, College of Medicine, University of Ha’il, Ha’il 55476, Saudi Arabia; (M.T.E.); (M.A.S.)
| | - Rasha M. El Bayomi
- Food Hygiene, Safety, and Technology Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt; (R.M.E.B.); (M.A.H.)
| | - Esraa A. Abdelkarim
- Food Hygiene, Safety, and Technology Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt; (R.M.E.B.); (M.A.H.)
| | - Abd El-Salam E. Hafez
- Food Hygiene, Safety, and Technology Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt; (R.M.E.B.); (M.A.H.)
| | - Mohamed S. Othman
- Department of Biochemistry, College of Medicine, University of Ha’il, Ha’il 55476, Saudi Arabia;
| | - Mohamed E. Ghoniem
- Department of Internal Medicine, College of Medicine, University of Ha’il, Ha’il 2240, Saudi Arabia;
| | - Mai A. Samak
- Department of Pathology, College of Medicine, University of Ha’il, Ha’il 55476, Saudi Arabia; (M.T.E.); (M.A.S.)
| | - Muteb H. Alshammari
- Department of Health Informatics, College of Public Health and Health Informatics, University of Ha’il, Ha’il 55476, Saudi Arabia;
| | - Fahad Awwadh Almarshadi
- Department of Public Health, College of Public Health and Health Informatics, University of Ha’il, Ha’il 55476, Saudi Arabia;
| | | | - Mohamed A. Hussein
- Food Hygiene, Safety, and Technology Department, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt; (R.M.E.B.); (M.A.H.)
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Roshani M, Taheri M, Goodarzi A, Yosefimashouf R, Shokoohizadeh L. Evaluation of antibiotic resistance, toxin-antitoxin systems, virulence factors, biofilm-forming strength and genetic linkage of Escherichia coli strains isolated from bloodstream infections of leukemia patients. BMC Microbiol 2023; 23:327. [PMID: 37925405 PMCID: PMC10625236 DOI: 10.1186/s12866-023-03081-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 10/22/2023] [Indexed: 11/06/2023] Open
Abstract
BACKGROUND One of the most common complications in patients with febrile neutropenia, lymphoma, leukemia, and multiple myeloma is a bloodstream infection (BSI). OBJECTIVE This study aimed to evaluate the antibiotic resistance patterns, virulence factors, biofilm-forming strength, and genetic linkage of Escherichia coli strains isolated from bloodstream infections (BSIs) of leukemia patients. METHODS The study conducted in Iran from June 2021 to December 2022, isolated 67 E. coli strains from leukemia patients' bloodstream infections in hospitals in two different areas. Several techniques including disk diffusion and broth microdilution were used to identify patterns of antibiotic resistance, microtiter plate assay to measure biofilm formation, and PCR to evaluate the prevalence of different genes such as virulence factors, toxin-antitoxin systems, resistance to β-lactams and fluoroquinolone antibiotics of E. coli strains. Additionally, the genetic linkage of the isolates was analyzed using the Enterobacterial Repeat Intergenic Consensus Polymerase Chain Reaction (ERIC-PCR) method. RESULTS The results showed that higher frequency of BSI caused by E. coli in man than female patients, and patients with acute leukemia had a higher frequency of BSI. Ampicillin and Amoxicillin-clavulanic acid showed the highest resistance, while Imipenem was identified as a suitable antibiotic for treating BSIs by E. coli. Multidrug-resistant (MDR) phenotypes were present in 22% of the isolates, while 53% of the isolates were ESBL-producing with the blaCTX-M gene as the most frequent β-lactamase gene. The fluoroquinolone resistance genes qnrB and qnrS were present in 50% and 28% of the isolates, respectively. More than 80% of the isolates showed the ability to form biofilms. The traT gene was more frequent than other virulence genes. The toxin-antitoxin system genes (mazF, ccdAB, and relB) showed a comparable frequency. The genetic diversity was detected in E. coli isolates. CONCLUSION Our results demonstrate that highly diverse, resistant and pathogenic E. coli clones are circulating among leukemia patients in Iranian hospitals. More attention should be paid to the treatment and management of E. coli bloodstream infections in patients with leukemia.
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Affiliation(s)
- Mahdaneh Roshani
- Department of Microbiology, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mohammad Taheri
- Department of Microbiology, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Alireza Goodarzi
- Infectious Disease Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Rassoul Yosefimashouf
- Department of Microbiology, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Leili Shokoohizadeh
- Department of Medical Laboratory Sciences, School of Paramedicine, Hamadan University of Medical Sciences, Hamadan, Iran.
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Tsai YY, Franca M, Camus A, Stabler LJ, Barbieri N, Logue CM. Laser Capture Microdissection, Culture Analysis, and Bacterial Sequencing to Evaluate the Microbiota of Focal Duodenal Necrosis in Egg Layers. Avian Dis 2023; 67:177-185. [PMID: 37556297 DOI: 10.1637/aviandiseases-d-22-00088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 05/05/2023] [Indexed: 08/11/2023]
Abstract
Focal duodenal necrosis (FDN) is a common intestinal disease of table egg layers. In this research we aimed to identify the bacteria commonly found in FDN lesions as seen with histopathological analysis. Fifty-nine ethanol-fixed duodenum samples were collected from egg layers on eight FDN-affected farms, and 42 samples had typical FDN lesions. Excision of bacteria-containing lesions using laser capture microdissection was performed, followed by 16S rRNA gene sequencing of extracted DNA for bacterial identification. Bacterial sequencing analysis revealed no consistent bacterial species identified from samples with FDN. However, analysis of the relative phylum abundance revealed differences in the duodenal microbiota between layers with FDN and healthy birds. There were differences in the abundance of Proteobacteria, Firmicutes, and Actinobacteria between FDN-positive and FDN-negative control samples compatible with intestinal dysbiosis. In addition, 10 duodenal samples with FDN lesions were collected for bacteriological analysis, yielding 47 colonies on tryptone soy agar, MacConkey agar, and blood agar plates. Using 16S rRNA gene PCR, 39/47 (53.8%) colonies were identified as Escherichia coli. PCR for E. coli virulence genes identified 21/39 (53.8%) E. coli isolates as avian pathogenic E. coli-like. PCR analysis for 19 E. coli virulence genes associated with intestinal disease strains including inflammatory bowel disease found 11/39 (28.2%) isolates containing more than 10 of these virulence genes. In conclusion, FDN appears to be a multifactorial inflammatory intestinal disease associated with intestinal dysbiosis, and Gram-negative bacteria including E. coli may contribute to the pathogenesis of this disease.
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Affiliation(s)
- Yu-Yang Tsai
- Department of Population Health, Athens GA 30602
| | | | - Alvin Camus
- Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602
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Emami A, Pirbonyeh N, Javanmardi F, Bazargani A, Moattari A, Keshavarzi A, Akbari A. Molecular diversity survey on diarrheagenic Escherichia coli isolates among children with gastroenteritis in Fars, Iran. Future Microbiol 2021; 16:1309-1318. [PMID: 34755537 DOI: 10.2217/fmb-2020-0151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: To differentiate Escherichia coli isolates from diarrheal pediatric patients in clinical laboratories. Materials & methods: Patients with watery diarrhea were selected for sampling and tested for diarrheagenic E. coli (DEC) by API kit. DEC isolates were tested for phylotyping, pathotyping and presence of determined virulence-encoding genes by specific molecular methods. Results: About 50% of isolates were detected as DECs (>55 and >31% were categorized B2 and D phylotypes respectively). Enterotoxigenic E. coli was the most and enteroinvasive E. coli was the lowest prevalent pathotypes. csg and fim genes were the most present virulence factors. Conclusion: Typing of E. coli isolates from stool specimens will help to determine the diversity of diarrheal pathogens and take proper decisions to reduce the health burden of diarrheal diseases.
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Affiliation(s)
- Amir Emami
- Department of Microbiology, Burn & Wound Healing Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Neda Pirbonyeh
- MSc of Microbiology, Burn & Wound Healing Research Center, Microbiology Department, Shiraz University of Medical Sciences, Shiraz, Iran.,Department of Bacteriology & Virology, School of Medicine, Shiraz University of Medical Sciences Shiraz, Iran
| | - Fatemeh Javanmardi
- Department of Microbiology, Burn & Wound Healing Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.,Department of Biostatistics, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Abdollah Bazargani
- Department of Bacteriology & Virology, School of Medicine, Shiraz University of Medical Sciences Shiraz, Iran
| | - Afagh Moattari
- Department of Bacteriology & Virology, School of Medicine, Shiraz University of Medical Sciences Shiraz, Iran
| | - Abdolkhalegh Keshavarzi
- Department of Surgery, Burn & Wound Healing Research Center,Shiraz University of Medical Sciences, Shiraz, Iran
| | - Ali Akbari
- Department of Anesthesiology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
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Administration of the Probiotic Escherichia coli Strain A0 34/86 Resulted in a Stable Colonization of the Human Intestine During the First Year of Life. Probiotics Antimicrob Proteins 2021; 12:343-350. [PMID: 31069717 DOI: 10.1007/s12602-019-09548-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Colinfant New Born (CNB) is an orally administered probiotic preparation containing the Escherichia coli strain A0 34/86, which is specially marketed for use in newborns and infants. Although the impact of different probiotics on the composition of the human gut microbiota has been previously described, the effects of E. coli probiotic consumption during infancy on the development of intestinal microbiota are not known. The effect of oral administration of CNB on the Enterobacteriaceae population was mapped using 16S rRNA gene sequencing in DNA samples isolated from the stools of one infant collected at 177 different time points during the first year of life. E. coli strains turnover was analyzed based on the detection of 26 genetic determinants, phylogroups, and pulsed-field gel electrophoresis (PFGE) analysis. Administration of CNB during the second and third month of life introduced the Escherichia genus to the infant's intestinal tract, and Escherichia became dominant among the Enterobacteriaceae family (p < 0.01). Genetic determinants, typical for probiotic E. coli A0 34/86 strain, were detected on the first day after application of CNB and persisted all year. In addition, nine transient E. coli strains were identified; these strains harbored different genetic determinants and showed different PFGE profiles. Transient strains were detected from 2 to 24 days in the stool samples. The first Escherichia colonizer originated from the application of the CNB probiotic preparation. Probiotic E. coli A0 34/86 successfully colonized the intestinal tract of an infant and became resident during the first year of life.
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Virulence, phylogenetic background and antimicrobial resistance in Escherichia coli associated with extraintestinal infections. J Infect Public Health 2020; 13:1537-1543. [DOI: 10.1016/j.jiph.2020.06.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 05/05/2020] [Accepted: 06/25/2020] [Indexed: 01/20/2023] Open
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Escherichia coli isolates from patients with inflammatory bowel disease: ExPEC virulence- and colicin-determinants are more frequent compared to healthy controls. Int J Med Microbiol 2018; 308:498-504. [PMID: 29735381 DOI: 10.1016/j.ijmm.2018.04.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 04/04/2018] [Accepted: 04/30/2018] [Indexed: 12/12/2022] Open
Abstract
A set of 178 Escherichia coli isolates taken from patients with inflammatory bowel disease (IBD) was analyzed for bacteriocin production and tested for the prevalence of 30 bacteriocin and 22 virulence factor determinants. Additionally, E. coli phylogenetic groups were also determined. Pulsed-field gel electrophoresis (PFGE) was used for exclusion of clonal character of isolates. Results were compared to data from a previously published analysis of 1283 fecal commensal E. coli isolates. The frequency of bacteriocinogenic isolates (66.9%) was significantly higher in IBD E. coli compared to fecal commensal E. coli isolates (54.2%, p < 0.01). In the group of IBD E. coli isolates, a higher prevalence of determinants for group B colicins (i.e., colicins B, D, Ia, Ib, M, and 5/10) (p < 0.01), including a higher prevalence of the colicin B determinant (p < 0.01) was found. Virulence factor determinants encoding fimbriae (fimA, 91.0%; pap, 27.5%), cytotoxic necrotizing factor (cnf1, 11.2%), aerobactin synthesis (aer, 43.3%), and the locus associated with invasivity (ial, 9.0%) were more prevalent in IBD E. coli (p < 0.05 for all five determinants). E. coli isolates from IBD mucosal biopsies were more frequently bacteriocinogenic (84.6%, p < 0.01) compared to fecal IBD isolates and fecal commensal E. coli. PFGE analysis revealed clusters specific for IBD E. coli isolates (n = 11), for fecal isolates (n = 13), and clusters containing both IBD and fecal isolates (n = 10). ExPEC (Extraintestinal Pathogenic E. coli) virulence and colicin determinants appear to be important characteristics of IBD E. coli isolates, especially the E. coli isolates obtained directly from biopsy samples.
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Grillová L, Sedláček I, Páchníková G, Staňková E, Švec P, Holochová P, Micenková L, Bosák J, Slaninová I, Šmajs D. Characterization of four Escherichia albertii isolates collected from animals living in Antarctica and Patagonia. J Vet Med Sci 2017; 80:138-146. [PMID: 29249728 PMCID: PMC5797873 DOI: 10.1292/jvms.17-0492] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Escherichia albertii is a recently discovered species with a limited number of well characterized strains. The aim of this study was to characterize four of the E. albertii strains, which were among 41 identified Escherichia strains isolated from the feces of living animals on James Ross Island, Antarctica, and Isla Magdalena, Patagonia. Sequencing of 16S rDNA, automated ribotyping, and rep-PCR were used to identify the four E. albertii isolates. Phylogenetic analyses based on multi-locus sequence typing showed these isolates to be genetically most similar to the members of E. albertii phylogroup G3. These isolates encoded several virulence factors including those, which are characteristic of E. albertii (cytolethal distending toxin and intimin) as well as bacteriocin determinants that typically have a very low prevalence in E. coli strains (D, E7). Moreover, E. albertii protein extracts caused cell cycle arrest in human cell line A375, probably because of cytolethal distending toxin activity.
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Affiliation(s)
- Linda Grillová
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
| | - Ivo Sedláček
- Czech Collection of Microorganisms, Department of Experimental Biology, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Gabriela Páchníková
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
| | - Eva Staňková
- Czech Collection of Microorganisms, Department of Experimental Biology, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Pavel Švec
- Czech Collection of Microorganisms, Department of Experimental Biology, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Pavla Holochová
- Czech Collection of Microorganisms, Department of Experimental Biology, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Lenka Micenková
- Research Centre for Toxic Compounds in the Environment, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Juraj Bosák
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
| | - Iva Slaninová
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
| | - David Šmajs
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
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Correlation Between hlyA and cnf1 Virulent Genes with Antibiotic Resistance and non-ESBLs Escherichia coli Isolates Collected from Patient with Urinary Tract Infections in Kerman, Iran. ARCHIVES OF PEDIATRIC INFECTIOUS DISEASES 2017. [DOI: 10.5812/pedinfect.61653] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Micenková L, Beňová A, Frankovičová L, Bosák J, Vrba M, Ševčíková A, Kmeťová M, Šmajs D. Human Escherichia coli isolates from hemocultures: Septicemia linked to urogenital tract infections is caused by isolates harboring more virulence genes than bacteraemia linked to other conditions. Int J Med Microbiol 2017; 307:182-189. [DOI: 10.1016/j.ijmm.2017.02.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 02/17/2017] [Accepted: 02/24/2017] [Indexed: 12/24/2022] Open
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Distribution of Uropathogenic Virulence Genes in Escherichia coli Isolated from Children with Urinary Tract Infection in Sanandaj, Iran. ARCHIVES OF PEDIATRIC INFECTIOUS DISEASES 2017. [DOI: 10.5812/pedinfect.41995] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Micenková L, Bosák J, Vrba M, Ševčíková A, Šmajs D. Human extraintestinal pathogenic Escherichia coli strains differ in prevalence of virulence factors, phylogroups, and bacteriocin determinants. BMC Microbiol 2016; 16:218. [PMID: 27646192 PMCID: PMC5028950 DOI: 10.1186/s12866-016-0835-z] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 09/13/2016] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND The study used a set of 407 human extraintestinal pathogenic E. coli strains (ExPEC) isolated from (1) skin and soft tissue infections, (2) respiratory infections, (3) intra-abdominal infections, and (4) genital smears. The set was tested for bacteriocin production, for prevalence of bacteriocin and virulence determinants, and for phylogenetic typing. Results obtained from the group of ExPEC strains were compared to data from our previously published analyses of 1283 fecal commensal E. coli strains. RESULTS The frequency of bacteriocinogeny was significantly higher in the set of ExPEC strains (63.1 %), compared to fecal E. coli (54.2 %; p < 0.01). Microcin producers and microcin determinants dominated in ExPEC strains, while colicin producers and colicin determinants were more frequent in fecal E. coli (p < 0.01). Higher production of microcin M and lower production of microcin B17, colicin Ib, and Js was detected in the set of ExPEC strains. ExPEC strains had a significantly higher prevalence of phylogenetic group B2 (52.6 %) compared to fecal E. coli strains (38.3 %; p < 0.01). CONCLUSIONS Human ExPEC strains were shown to differ from human fecal strains in a number of parameters including bacteriocin production, prevalence of several bacteriocin and virulence determinants, and prevalence of phylogenetic groups. Differences in these parameters were also identified within subgroups of ExPEC strains of diverse origin. While some microcin determinants (mM, mH47) were associated with virulent strains, other bacteriocin types (mB17, Ib, and Js) were associated with fecal flora.
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Affiliation(s)
- Lenka Micenková
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Building A6, 625 00 Brno, Czech Republic
| | - Juraj Bosák
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Building A6, 625 00 Brno, Czech Republic
| | - Martin Vrba
- Department of Clinical Microbiology, Faculty Hospital Brno, Jihlavská 20, 625 00 Brno, Czech Republic
| | - Alena Ševčíková
- Department of Clinical Microbiology, Faculty Hospital Brno, Jihlavská 20, 625 00 Brno, Czech Republic
| | - David Šmajs
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Building A6, 625 00 Brno, Czech Republic
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Characterization of Vaginal Escherichia coli Isolated from Pregnant Women in Two Different African Sites. PLoS One 2016; 11:e0158695. [PMID: 27387665 PMCID: PMC4936694 DOI: 10.1371/journal.pone.0158695] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 06/20/2016] [Indexed: 11/19/2022] Open
Abstract
The relevance of vaginal colonization of pregnant women by Escherichia coli is poorly understood, despite these strains sharing a similar virulence profile with other extraintestinal pathogenic E. coli producing severe obstetric and neonatal infections. We characterized the epidemiology, antimicrobial susceptibility and virulence profiles of 84 vaginal E. coli isolates from pregnant women from Rabat (Morocco) and Manhiça (Mozambique), two very distinct epidemiological settings. Low levels of antimicrobial resistance were observed to all drugs tested, except for trimethoprim-sulfamethoxazole in Manhiça, where this drug is extensively used as prophylaxis for opportunistic HIV infections. The most prevalent virulence factors were related to iron acquisition systems. Phylogroup A was the most common in Rabat, while phylogroups E and non-typeable were the most frequent in Manhiça. Regardless of the apparently "low virulence" of these isolates, the frequency of infections is higher and the outcomes more devastating in constrained-resources conditions, especially among pregnant women and newborns.
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Sáez-López E, Guiral E, Fernández-Orth D, Villanueva S, Goncé A, López M, Teixidó I, Pericot A, Figueras F, Palacio M, Cobo T, Bosch J, Soto SM. Vaginal versus Obstetric Infection Escherichia coli Isolates among Pregnant Women: Antimicrobial Resistance and Genetic Virulence Profile. PLoS One 2016; 11:e0146531. [PMID: 26784330 PMCID: PMC4718642 DOI: 10.1371/journal.pone.0146531] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 12/19/2015] [Indexed: 12/16/2022] Open
Abstract
Vaginal Escherichia coli colonization is related to obstetric infections and the consequent development of infections in newborns. Ampicillin resistance among E. coli strains is increasing, which is the main choice for treating empirically many obstetric and neonatal infections. Vaginal E. coli strains are very similar to extraintestinal pathogenic E. coli with regards to the virulence factors and the belonging to phylogroup B2. We studied the antimicrobial resistance and the genetic virulence profile of 82 E. coli isolates from 638 vaginal samples and 63 isolated from endometrial aspirate, placental and amniotic fluid samples from pregnant women with obstetric infections. The prevalence of E. coli in the vaginal samples was 13%, which was significant among women with associated risk factors during pregnancy, especially premature preterm rupture of membranes (p<0.0001). Sixty-five percent of the strains were ampicillin-resistant. The E. coli isolates causing obstetric infections showed higher resistance levels than vaginal isolates, particularly for gentamicin (p = 0.001). The most prevalent virulence factor genes were those related to the iron uptake systems revealing clear targets for interventions. More than 50% of the isolates belonged to the virulent B2 group possessing the highest number of virulence factor genes. The ampicillin-resistant isolates had high number of virulence factors primarily related to pathogenicity islands, and the remarkable gentamicin resistance in E. coli isolates from women presenting obstetric infections, the choice of the most appropriate empiric treatment and clinical management of pregnant women and neonates should be carefully made. Taking into account host-susceptibility, the heterogeneity of E. coli due to evolution over time and the geographical area, characterization of E. coli isolates colonizing the vagina and causing obstetric infections in different regions may help to develop interventions and avoid the aetiological link between maternal carriage and obstetric and subsequent puerperal infections.
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Affiliation(s)
- Emma Sáez-López
- Department of Microbiology, Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
| | - Elisabet Guiral
- Department of Microbiology, Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
| | - Dietmar Fernández-Orth
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
| | - Sonia Villanueva
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
| | - Anna Goncé
- BCNatal-Barcelona Center of Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu), Barcelona, Spain
- Institut D´Investigacions Biomèdiques August Pi I Sunyer (DIBAPS), Barcelona, Spain
- University of Barcelona, Barcelona, Spain
- Center for Biomedical Research on Rare Diseases (CIBER-ER), Barcelona, Spain
| | - Marta López
- BCNatal-Barcelona Center of Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu), Barcelona, Spain
- Institut D´Investigacions Biomèdiques August Pi I Sunyer (DIBAPS), Barcelona, Spain
- University of Barcelona, Barcelona, Spain
- Center for Biomedical Research on Rare Diseases (CIBER-ER), Barcelona, Spain
| | - Irene Teixidó
- BCNatal-Barcelona Center of Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu), Barcelona, Spain
- Institut D´Investigacions Biomèdiques August Pi I Sunyer (DIBAPS), Barcelona, Spain
- University of Barcelona, Barcelona, Spain
- Center for Biomedical Research on Rare Diseases (CIBER-ER), Barcelona, Spain
| | - Anna Pericot
- BCNatal-Barcelona Center of Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu), Barcelona, Spain
- Institut D´Investigacions Biomèdiques August Pi I Sunyer (DIBAPS), Barcelona, Spain
- University of Barcelona, Barcelona, Spain
- Center for Biomedical Research on Rare Diseases (CIBER-ER), Barcelona, Spain
| | - Francesc Figueras
- BCNatal-Barcelona Center of Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu), Barcelona, Spain
- Institut D´Investigacions Biomèdiques August Pi I Sunyer (DIBAPS), Barcelona, Spain
- University of Barcelona, Barcelona, Spain
- Center for Biomedical Research on Rare Diseases (CIBER-ER), Barcelona, Spain
| | - Montse Palacio
- BCNatal-Barcelona Center of Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu), Barcelona, Spain
- Institut D´Investigacions Biomèdiques August Pi I Sunyer (DIBAPS), Barcelona, Spain
- University of Barcelona, Barcelona, Spain
- Center for Biomedical Research on Rare Diseases (CIBER-ER), Barcelona, Spain
| | - Teresa Cobo
- BCNatal-Barcelona Center of Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu), Barcelona, Spain
- Institut D´Investigacions Biomèdiques August Pi I Sunyer (DIBAPS), Barcelona, Spain
- University of Barcelona, Barcelona, Spain
- Center for Biomedical Research on Rare Diseases (CIBER-ER), Barcelona, Spain
| | - Jordi Bosch
- Department of Microbiology, Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
| | - Sara M. Soto
- Department of Microbiology, Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
- * E-mail:
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Štaudová B, Micenková L, Bosák J, Hrazdilová K, Slaninková E, Vrba M, Ševčíková A, Kohoutová D, Woznicová V, Bureš J, Šmajs D. Determinants encoding fimbriae type 1 in fecal Escherichia coli are associated with increased frequency of bacteriocinogeny. BMC Microbiol 2015; 15:201. [PMID: 26445407 PMCID: PMC4594643 DOI: 10.1186/s12866-015-0530-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 09/25/2015] [Indexed: 01/03/2023] Open
Abstract
Background To screen whether E. coli strains encoding type 1 fimbriae, isolated from fecal microflora, produce bacteriocins more often relative to fimA-negative E. coli strains of similar origin. Methods PCR assays were used to detect presence of genes encoding 30 bacteriocin determinants (23 colicin- and 7 microcin-encoding genes) and 18 virulence determinants in 579 E. coli strains of human and animal origin isolated from hospitals and animal facilities in the Czech and Slovak Republic. E. coli strains were also classified into phylogroups (A, B1, B2 and D). Results fimA-negative E. coli strains (defined as those possessing none of the 18 tested virulence determinants) were compared to fimA-positive E. coli strains (possessing fimA as the only detected virulence determinant). Strains with identified bacteriocin genes were more commonly found among fimA-positive E. coli strains (35.6 %) compared to fimA-negative E. coli strains (21.9 %, p < 0.01) and this was true for both colicin and microcin determinants (p = 0.02 and p < 0.01, respectively). In addition, an increased number of strains encoding colicin E1 were found among fimA-positive E. coli strains (p < 0.01). Conclusions fimA-positive E. coli strains produced bacteriocins (colicins and microcins) more often compared to fimA-negative strains of similar origin. Since type 1 fimbriae of E. coli have been shown to mediate adhesion to epithelial host cells and help colonize the intestines, bacteriocin synthesis appears to be an additional feature of colonizing E. coli strains. Electronic supplementary material The online version of this article (doi:10.1186/s12866-015-0530-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Barbora Štaudová
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Building A6, 625 00, Brno, Czech Republic.
| | - Lenka Micenková
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Building A6, 625 00, Brno, Czech Republic.
| | - Juraj Bosák
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Building A6, 625 00, Brno, Czech Republic.
| | - Kristýna Hrazdilová
- Department of Infectious Diseases and Microbiology, Faculty of Veterinary Medicine, University of Veterinary and Pharmaceutical Sciences Brno, Palackého tř. 1/3, 612 42, Brno, Czech Republic. .,CEITEC - Central European Institute of Technology, University of Veterinary and Pharmaceutical Sciences Brno, Palackého tř. 1/3, 612 42, Brno, Czech Republic.
| | - Eva Slaninková
- Department of Infectious Diseases and Microbiology, Faculty of Veterinary Medicine, University of Veterinary and Pharmaceutical Sciences Brno, Palackého tř. 1/3, 612 42, Brno, Czech Republic.
| | - Martin Vrba
- Department of Clinical Microbiology, Faculty Hospital Brno, Jihlavská 20, 625 00, Brno, Czech Republic.
| | - Alena Ševčíková
- Department of Clinical Microbiology, Faculty Hospital Brno, Jihlavská 20, 625 00, Brno, Czech Republic.
| | - Darina Kohoutová
- 2nd Department of Internal Medicine - Gastroenterology, Charles University in Praha, Faculty of Medicine at Hradec Kralové, University Teaching Hospital, Sokolská 581, Hradec Kralové, 500 05, Czech Republic.
| | - Vladana Woznicová
- Department of Microbiology, Faculty of Medicine, Masaryk University and St. Anne's University Hospital, Pekařská 53, 656 91, Brno, Czech Republic.
| | - Jan Bureš
- 2nd Department of Internal Medicine - Gastroenterology, Charles University in Praha, Faculty of Medicine at Hradec Kralové, University Teaching Hospital, Sokolská 581, Hradec Kralové, 500 05, Czech Republic.
| | - David Šmajs
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Building A6, 625 00, Brno, Czech Republic.
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Rahdar M, Rashki A, Miri HR, Rashki Ghalehnoo M. Detection of pap, sfa, afa, foc, and fim Adhesin-Encoding Operons in Uropathogenic Escherichia coli Isolates Collected From Patients With Urinary Tract Infection. Jundishapur J Microbiol 2015; 8:e22647. [PMID: 26464770 PMCID: PMC4600570 DOI: 10.5812/jjm.22647] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 11/19/2014] [Accepted: 01/05/2015] [Indexed: 02/07/2023] Open
Abstract
Background: Uropathogenic Escherichia coli (UPEC) with its virulence factors is the most prevalent cause of urinary tract infection (UTI). Objectives; This study aimed to determine the occurrence of fim, pap, sfa, and afa genes among 100 UPEC isolates collected from patients diagnosed with UTI. Materials and Methods A total of 100 UPEC isolates were obtained from urine samples of patients with UTI. The prevalence of 5 virulence genes encoding type 1 fimbriae (fimH), pili associated with pyelonephritis (pap), S and F1C fimbriae (sfa and foc) and afimbrial adhesins (afa) were determined through PCR method. We also investigated the phylogenetic background of all isolates. In addition, the distribution of adhesin-encoding operons between the phylogroups was assessed. Results: The prevalence of genes encoding for fimbrial adhesive systems was 95% for fim, 57% for pap, 16% for foc, and 81% for sfa. The operons encoding for afa afimbrial adhesins were identified in 12% of isolates. The various combinations of detected genes were designated as virulence patterns. The fim gene, which occurred in strains from all phylogenetic groups (A, B1, B2, and D) was evaluated and no significant differences were found among these groups. Conversely, significant differences were observed in relation to pap, afa, foc, and sfa operons. Conclusions: These results indicate that the PCR method is a powerful genotypic assay for the detection of adhesin-encoding operons. Thus, this assay can be recommended for clinical use to detect virulent urinary E. coli strains, as well as epidemiological studies.
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Affiliation(s)
- Masoud Rahdar
- Department of Biology, Faculty of Basic Sciences, University of Zabol, Zabol, IR Iran
| | - Ahmad Rashki
- Department of Physiopathology, Faculty of Vet-Medicine, University of Zabol, Zabol, IR Iran
- Corresponding author: Ahmad Rashki, Department of Physiopathology, Faculty of Vet-Medicine, University of Zabol, Zabol, IR Iran. Tel: +98-9151970877, Fax: +98-5424822251, E-mail:
| | - Hamid Reza Miri
- Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, IR Iran
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Micenková L, Sišková P, Bosák J, Jamborová I, Cernohorská L, Smajs D. Characterization of human uropathogenic ESBL-producing Escherichia coli in the Czech Republic: spread of CTX-M-27-producing strains in a university hospital. Microb Drug Resist 2015; 20:610-7. [PMID: 24959675 DOI: 10.1089/mdr.2014.0013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AIMS The purpose of this study was to characterize the extended-spectrum β-lactamase (ESBL)-producing uropathogenic Escherichia coli (UPEC) strains isolated in the South Moravia region of the Czech Republic. RESULTS Out of 109 ESBL-producing UPEC isolates, the CTX-M-15-producing E. coli O25b-ST131 was detected in 55 (50.5%) and the CTX-M-27-producing E. coli O25b-ST131 in 40 isolates (36.7%). Most isolates were distributed among three pulsed-field gel electrophoresis clusters and were characterized by low variability relative to antibiotic resistance patterns, in E. coli phylogroups and by the prevalence of virulence and bacteriocin determinants. Despite this, 14 groups of identical isolates (comprising a total of 41 isolates) were identified when all tested parameters of E. coli were combined. CONCLUSIONS Since the occurrence of E. coli B2-O25b-ST131 CTX-M-27 was only recently described in Asia, the frequent isolation of this lineage among patients in South Moravia suggests an efficient transfer of this clone from Asian countries. The limited variability of detected parameters of ESBL-producing UPEC strains is consistent with a common origin of the analyzed isolates, in which there is an ongoing process of genetic diversification.
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Affiliation(s)
- Lenka Micenková
- 1 Department of Biology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
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Lüthje P, Brauner A. Virulence factors of uropathogenic E. coli and their interaction with the host. Adv Microb Physiol 2014; 65:337-72. [PMID: 25476769 DOI: 10.1016/bs.ampbs.2014.08.006] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Urinary tract infections (UTIs) belong to the most common infectious diseases worldwide. The most frequently isolated pathogen from uncomplicated UTIs is Escherichia coli. To establish infection in the urinary tract, E. coli has to overcome several defence strategies of the host, including the urine flow, exfoliation of urothelial cells, endogenous antimicrobial factors and invading neutrophils. Thus, uropathogenic E. coli (UPEC) harbour a number of virulence and fitness factors enabling the bacterium to resist and overcome these different defence mechanisms. There is no particular factor which allows the identification of UPEC among the commensal faecal flora apart from the ability to enter the urinary tract and cause an infection. Many of potential virulence or fitness factors occur moreover with high redundancy. Fimbriae are inevitable for adherence to and invasion into the host cells; the type 1 pilus is an established virulence factor in UPEC and indispensable for successful infection of the urinary tract. Flagella and toxins promote bacterial dissemination, while different iron-acquisition systems allow bacterial survival in the iron-limited environment of the urinary tract. The immune response to UPEC is primarily mediated by toll-like receptors recognising lipopolysaccharide, flagella and other structures on the bacterial surface. UPEC have the capacity to subvert this immune response of the host by means of actively impacting on pro-inflammatory signalling pathways, or by physical masking of immunogenic structures. The large repertoire of bacterial virulence and fitness factors in combination with host-related differences results in a complex interaction between host and pathogen in the urinary tract.
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Affiliation(s)
- Petra Lüthje
- Department of Microbiology, Tumor and Cell Biology, Division of Clinical Microbiology, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
| | - Annelie Brauner
- Department of Microbiology, Tumor and Cell Biology, Division of Clinical Microbiology, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden.
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Rahdar M, Rashki A, Miri H. Comparison of the Common Adhesin Coding Operons Distribution in Uropathogenic and Phylogenetic Group B2 and A Escherichia coli Isolates. ACTA ACUST UNITED AC 2014. [DOI: 10.17795/ajcmi-22981] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Micenková L, Štaudová B, Bosák J, Mikalová L, Littnerová S, Vrba M, Ševčíková A, Woznicová V, Šmajs D. Bacteriocin-encoding genes and ExPEC virulence determinants are associated in human fecal Escherichia coli strains. BMC Microbiol 2014; 14:109. [PMID: 24774171 PMCID: PMC4021369 DOI: 10.1186/1471-2180-14-109] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 04/22/2014] [Indexed: 11/10/2022] Open
Abstract
Background A set of 1181 E. coli strains of human fecal origin isolated in the South Moravia region of the Czech Republic was collected during the years 2007–2010. Altogether, 17 virulence determinants and 31 bacteriocin-encoding genes were tested in each of them. Results The occurrence of bacteriocin-encoding genes was found to be positively correlated with the occurrence of E. coli virulence factors. Based on the presence of virulence factors and their combinations, E. coli strains were classified as non-pathogenic E. coli (n = 399), diarrhea-associated E. coli (n = 179) and ExPEC strains (n = 603). Non-pathogenic and diarrhea-associated E. coli strains had a low frequency of bacteriocinogeny (32.6% and 36.9%, respectively). ExPEC strains encoding S-fimbriae (sfa), P-fimbriae (pap) and having genes for aerobactin biosynthesis (aer, iucC), α-hemolysis (α-hly) and cytotoxic necrosis factor (cnf1) were often bacteriocinogenic (73.8%), had a high prevalence of bacteriocin multi-producers and showed a higher frequency of genes encoding microcins H47, M, V, B17 and colicins E1, Ia and S4. Conclusions The occurrence of bacteriocin-encoding genes and ExPEC virulence determinants correlate positively in E. coli strains of human fecal origin. Bacteriocin synthesis appears to modulate the ability of E. coli strains to reside in the human intestine and/or the virulence of the corresponding strains.
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Affiliation(s)
| | | | | | | | | | | | | | | | - David Šmajs
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Building A6, Brno 625 00, Czech Republic.
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Al-Mayahie SMG. Vaginal colonization by papG allele II+ Escherichia coli isolates from pregnant and nonpregnant women as predisposing factor to pyelonephritis. Infect Dis Obstet Gynecol 2013; 2013:860402. [PMID: 23861574 PMCID: PMC3703789 DOI: 10.1155/2013/860402] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Revised: 06/04/2013] [Accepted: 06/06/2013] [Indexed: 11/21/2022] Open
Abstract
Vaginal (61) and fecal (61) Escherichia coli isolates from pregnant and nonpregnant women (18-45 years old) were surveyed for papG alleles by PCR technique. papG allele II was the most prevalent among both vaginal (32.7%) and fecal (3.2%) isolates, whereas other alleles were found only among vaginal isolates (1.6% for alleles I and III and 3.2% for alleles II + III). papG(+) pregnant women's isolates did not differ significantly from those of nonpregnant in possession of papG allele II (90% versus 73.3%), whereas both (32.7%) differed significantly (P ≤ 0.05) in comparison with fecal isolates (3.2%). The vast majority of papG allele II(+) vaginal isolates were clustered in group B2 (81.8%) and much less in group D (18.1%). Also, most of them were positive for fimH (100%), papC (100%), iucC (90.9%), and hly (72.7%), and about half of them were positive for sfa/foc (45.4%). In addition, the mean of VFs' gene possession was 3.5 (range from 2 to 5). It can be concluded that vaginal colonization by papG allele II(+) E. coli is possibly one of the predisposing factors of both pregnant and nonpregnant women to pyelonephritis, but its potential may be modified by other factors especially host factors.
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Involvement of virulence properties and antibiotic resistance in Escherichia coli strains causing pyelonephritis in children. Folia Microbiol (Praha) 2012; 58:53-9. [DOI: 10.1007/s12223-012-0176-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Accepted: 06/04/2012] [Indexed: 01/17/2023]
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Sun J, Hu J, Peng H, Shi J, Dong Z. Molecular and physiological characterization of fluoroquinolone resistance in relation to uropathogenicity among Escherichia coli isolates isolated from Wenyu River, China. CHEMOSPHERE 2012; 87:37-42. [PMID: 22182707 DOI: 10.1016/j.chemosphere.2011.11.050] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2011] [Revised: 11/15/2011] [Accepted: 11/22/2011] [Indexed: 05/31/2023]
Abstract
Increasing antibacterial resistance and pathogenicity in the environment is of growing concern due to its potential human risk. In the present study, 236 Escherichia coli isolates were collected from Wenyu River in China on drugless (48 isolates) and quinolone-containing plates (189 isolates). Their minimum inhibitory concentrations (MICs) were determined ranging from 0.125 μg mL(-1) to 128 μg mL(-1). Mutation points related to fluoroquinolone resistance were observed at S83 to L and D87 to N or Y in the GyrA subunit and S80 to R or I and E84 to G in the ParC subunit. Generally, MICs of LEV and GAT are dependent on the patterns of these mutation points. The profile with three mutation points was related to LEV-resistant E. coli isolates, and the (S83L, D87N+S80I) mutation profile was most prevalent (65.7%) in LEV-resistant isolates, while a large proportion of isolates, even those with three mutation points, were susceptive to GAT. The incidence of virulence factors in LEV-resistant isolates (44.7%, 59/132) was much higher than in nonresistant isolates (23.1%, 24/104) (χ(2)=11.925, 1° of freedom, p<0.001) indicating that fluoroquinolone-resistant E. coli would pose a potential risk. A similar distribution was also found in isolates resistant to GAT (χ(2)=7.843, 1° of freedom, p=0.0079).
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Affiliation(s)
- Jianxian Sun
- College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
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Regua-Mangia AH, Irino K, da Silva Pacheco R, Pimentel Bezerra RM, Santos Périssé AR, Teixeira LM. Molecular characterization of uropathogenic and diarrheagenic Escherichia coli pathotypes. J Basic Microbiol 2011; 50 Suppl 1:S107-15. [PMID: 20806245 DOI: 10.1002/jobm.200900364] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Accepted: 03/13/2010] [Indexed: 11/05/2022]
Abstract
In this study diarrheagenic and uropathogenic Escherichia coli (UPEC) strains were comparatively characterized according to serotype, hemolytic activity, protein polymorphism among housekeeping enzymes, phylogenetic group and urovirulence genes. Intra-serogroup/serotype variations were observed. Hemolytic activity was detected in 100%, 93%, 67% and 39% of UPEC, EAEC, EPEC and ETEC strains, respectively. The alpha-hemolytic phenotype was observed in all pathogenic groups while beta-hemolytic phenotype was less frequent. PCR phylotyping revealed higher prevalence of diarrheagenic E. coli in groups A and D while uropathogenic strains were mainly found in subgroup B2. Amplification assays revealed that 74%, 45% and 22% of UPEC, EAEC and EPEC strains, respectively, carried at least one of the urovirulence sequences. The molecular typing system revealed a pathotype-specific clonal group distribution and showed a closer relationship between the EAEC and UPEC. Additionally, the occurrence of urovirulence traits, especially those related to iron acquisition, was more frequent among EAEC and UPEC than among the other E. coli pathotypes. This observation is of special value considering that the EAEC pathotype constitutes an emerging group of enteropathogens, particularly, in developing countries, and information on their pathogenic and phylogenetic characteristics is still scarce.
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A novel gene R049 identified in uropathogenic Escherichia coli provides partial protection in mice from colonization. CHINESE SCIENCE BULLETIN-CHINESE 2011. [DOI: 10.1007/s11434-010-4342-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Guiral E, Bosch J, Vila J, Soto SM. Prevalence of Escherichia coli among samples collected from the genital tract in pregnant and nonpregnant women: relationship with virulence. FEMS Microbiol Lett 2010; 314:170-3. [PMID: 21133987 DOI: 10.1111/j.1574-6968.2010.02160.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Escherichia coli are enteric Gram-negative bacilli that can colonize the female genital tract and become implicated in different infections in pregnant women, including intra-amniotic infection, puerperal infections and neonatal infections. The virulence profiles of E. coli isolates from vaginal swabs from pregnant and nonpregnant women were compared. The hly-, cnf-, pap- and iroN-genes were found significantly more frequently in E. coli isolated from pregnant women in comparison with those isolated from nonpregnant women. Escherichia coli from pregnant women seem to be more virulent than from nonpregnant women developing severe infections, thereby increasing possible neonatal sepsis.
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Affiliation(s)
- Elisabet Guiral
- Department of Clinical Microbiology, Hospital Clinic, IDIBAPS, School of Medicine, University of Barcelona, Barcelona, Spain
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Comparison of infection of different cell lines by uropathogenic Escherichia coli. Sci Bull (Beijing) 2009. [DOI: 10.1007/s11434-009-0389-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hilbert DW, Paulish TE, Mordechai E, Adelson ME, Trama JP. O serogroups, phylogeny, and virulence factors of cervicovaginal and rectal Escherichia coli isolates. Eur J Clin Microbiol Infect Dis 2008; 27:1265-8. [PMID: 18584221 DOI: 10.1007/s10096-008-0574-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2008] [Accepted: 06/04/2008] [Indexed: 11/30/2022]
Affiliation(s)
- D W Hilbert
- Research and Development Department, Medical Diagnostic Laboratories LLC, 2439 Kuser Rd, Hamilton, NJ 08690, USA
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