A study of virulence factors of E. coli strains isolated from cases of urinary tract infection

The aim of this study was to demonstrate virulence factors namely adhesins, hemolysin and cell surface hydrophobicity of E. coli strains isolated from cases of urinary tract infection.A total of 210 E. coli strains were isolated from 602 culture positive cases of urinary tract infections. UPEC strains were screened for virulence factors namely hemolysin, hemagglutination and cell surface hydrophobicity by recommended methods. Out of 210 E. coli strains tested, 70 (33.34%) were hemolytic, 94 (44.76%) showed hemagglutination and 46 (21.90%) were cell surface hydrophobicity positive. Our study shows that a large number of uropathogenic E. coli strains had one or more virulence factors. The methods of detection of above-mentioned virulence factors are reasonably easy and screening them in a clinical microbiology laboratory is a worthwhile exercise.

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Distribution of virulence genes and phylogenetics of uropathogenic Escherichia coli among urinary tract infection patients in Addis Ababa, Ethiopia

10.21203/rs.2.9756/v1 ◽

2019 ◽

Author(s):

Belayneh Regasa Dadi ◽

Tamrat Abebe ◽

Lixin Zhang ◽

Adane Mihret ◽

Workeabeba Abebe ◽

...

Keyword(s):

Escherichia Coli ◽

Urinary Tract Infection ◽

Urinary Tract ◽

Tract Infection ◽

Virulence Factors ◽

Virulence Genes ◽

Virulence Gene ◽

Uropathogenic Escherichia Coli ◽

E Coli ◽

Tract Infections

Abstract Background Urinary tract infection (UTI) is a common cause of morbidity and mortality worldwide. Uropathogenic Escherichia coli (UPEC) bacteria are the major cause of urinary tract infections. UPEC strains derive from different phylogenetic groups and possess an arsenal of virulence factors that contribute to their ability to overcome different defense mechanisms and cause disease. The objective of this study was to identify phylogroup and virulence genes of UPEC among urinary tract infection patients. Methods A total of 200 E. coli bacteria were isolated from 780 UTI patients using culture and conventional biochemical tests. Identification of phylogroup and genes that encodes for virulence factors was done using multiplex polymerase chain reaction (PCR). Data was processed and analyzed with SPSS version16.0 and Epi-info version 3.4.1 software. Result The most common urologic clinical manifestation combinations in this study were dysuria, urine urgency and urgency incontinence. The frequent UPEC virulence gene identified was fim H 164 (82%), followed by aer 109 (54.5%), hly 103 (51.5%), pap 59 (29.5%), cnf 58 (29%), sfa 50 (25%) and afa 24 (12%).There was significant association between pap gene and urine urgency (p-0.016); sfa and dysuria and urine urgency (p-0.019 and p-0.043 respectively); hly and suprapubic pain (p-0.002); aer and suprapubic pain, flank pain and fever (p-0.017, p-0.040, p-0.029 respectively). Majority of E. coli isolates were phylogroup B2 60(30%) followed by D 55(27.5%), B1 48(24%) and A 37(18.5%). There was significant association between E. coli phylogroup B2 and three virulence genes namely afa, pap, and sfa (p-0.014, p-0.002, p-0.004 respectively). Conclusion In this study the most frequent E. coli virulence gene was fim H, followed by aer, hly, pap, cnf, sfa and afa respectively. There was significant association between E. coli virulence genes and clinical symptoms of UTI. The phylogenetic analysis indicates majority of uropathogenic E. coli isolates were phylogroup B2 followed by phylogroup D. Phylogroup B2 carries more virulence genes. Hence, targeting major UPEC phylogroup and virulence genes for potential vaccine candidates is essential for better management of UTI and further research has to be conducted in this area.

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URINARY INFECTION AT DEPARTMENT OF UROLOGY OF HUE UNIVERSITY OF MEDICINE AND PHARMACY HOSPITAL

Journal of Medicine and Pharmacy ◽

10.34071/jmp.2018.3.16 ◽

2018 ◽

pp. 100-108

Author(s):

Dinh Khanh Le ◽

Dinh Dam Le ◽

Khoa Hung Nguyen ◽

Xuan My Nguyen ◽

Minh Nhat Vo ◽

...

Keyword(s):

Urinary Tract Infection ◽

Urinary Tract ◽

Tract Infection ◽

Urinary Tract Infections ◽

Urine Culture ◽

Clinical Manifestations ◽

University Hospital ◽

E Coli ◽

Positive Urine ◽

Tract Infections

Objectives: To investigate clinical characteristics, bacterial characteristics, drug resistance status in patients with urinary tract infections treated at Department of Urology, Hue University Hospital. Materials and Method: The study was conducted in 474 patients with urological disease treated at Department of Urology, Hue Universiry Hospital from July 2017 to April 2018. Urine culture was done in the patients with urine > 25 Leu/ul who have symptoms of urinary tract disease or infection symptoms. Patients with positive urine cultures were analyzed for clinical and bacterial characteristics. Results: 187/474 (39.5%) patients had symptoms associated with urinary tract infections. 85/474 (17.9%) patients were diagnosed with urinary tract infection. The positive urine culture rate was 45.5%. Symptoms of UTI were varied, and no prominent symptoms. E. coli accounts for the highest proportion (46.67%), followed by, Staphycoccus aureus (10.67%), Pseudomonas aeruginsa (8,0%), Streptococcus faecali and Proteus (2.67%). ESBL - producing E. coli was 69.23%, ESBL producing Enterobacter spp was 33.33%. Gram-negative bacteria are susceptible to meropenem, imipenem, amikacin while gram positive are vancomycin-sensitive. Conclusions: Clinical manifestations of urinary tract infections varied and its typical symptoms are unclear. E.coli is a common bacterium (46.67%). Isolated bacteria have a high rate of resistance to some common antibiotics especially the third generation cephalosporins and quinolones. Most bacteria are resistant to multiple antibiotics at the same time. Gram (+) bacteria are susceptible to vancomycin, and gram (-) bacteria are susceptible to cefoxitin, amikacin, and carbapenem. Key words: urinary tract infection

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Synchrotron X-Ray Fluorescence Microscopy of Gallium in Bladder Tissue following Gallium Maltolate Administration during Urinary Tract Infection

Antimicrobial Agents and Chemotherapy ◽

10.1128/aac.00616-13 ◽

2013 ◽

Vol 57 (11) ◽

pp. 5197-5201 ◽

Cited By ~ 3

Author(s):

Katherine R. Ball ◽

Francesca Sampieri ◽

Manuel Chirino ◽

Don L. Hamilton ◽

Robert I. R. Blyth ◽

...

Keyword(s):

Urinary Tract Infection ◽

Urinary Tract ◽

Tract Infection ◽

Transitional Epithelium ◽

Bladder Tissue ◽

Content Type ◽

X Ray ◽

E Coli ◽

Tract Infections ◽

X Ray Absorption

ABSTRACTA mouse model of cystitis caused by uropathogenicEscherichia coliwas used to study the distribution of gallium in bladder tissue following oral administration of gallium maltolate during urinary tract infection. The median concentration of gallium in homogenized bladder tissue from infected mice was 1.93 μg/g after daily administration of gallium maltolate for 5 days. Synchrotron X-ray fluorescence imaging and X-ray absorption spectroscopy of bladder sections confirmed that gallium arrived at the transitional epithelium, a potential site of uropathogenicE. coliinfection. Gallium and iron were similarly but not identically distributed in the tissues, suggesting that at least some distribution mechanisms are not common between the two elements. The results of this study indicate that gallium maltolate may be a suitable candidate for further development as a novel antimicrobial therapy for urinary tract infections caused by uropathogenicE. coli.

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Correlation between uropathogenic properties ofEscherichia colifrom urinary tract infections and the antibody-coated bacteria test and comparison with faecal strains

Journal of Hygiene ◽

10.1017/s0022172400069230 ◽

1981 ◽

Vol 87 (1) ◽

pp. 53-61 ◽

Cited By ~ 12

Author(s):

Heather J. L. Brooks ◽

Barbara A. Benseman ◽

Jayne Peck ◽

K. A. Bettelheim

Keyword(s):

Urinary Tract Infection ◽

Urinary Tract ◽

Tract Infection ◽

World Literature ◽

Symptomatic Urinary Tract Infection ◽

E Coli ◽

High K ◽

Serotype 1 ◽

H Serotypes ◽

Tract Infections

SummaryStrains ofEscherichia coliisolated from adult females with symptomatic urinary tract infection were found to possess the following properties significantly more frequently than faecal strains: (i) high K-antigen titre; (ii) haemolysin; (iii) type 1 pili; (iv) mannose-resistant haemagglutination; (v) fermentation of dulcitol and salicin; (vi) O serotype 2, 6 and 75; (vii) H serotype 1.E. coliisolated from urine specimens containing significant numbers of antibody-coated bacteria were richer in these seven properties than strains from urines without detectable antibody-coated bacteria.The O and H serotypes ofE. coliobtained from patients with urinary tract infection in two New Zealand cities were compared with those reported in the world literature and found to be similar.

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Evaluation of ESBL (Extended Spectrum Beta-Lactamase) Producing Escherichia Coli Isolated from Patients with Urinary Tract Infection by Phenotypic and Genotypic Methods

10.21203/rs.3.rs-23726/v1 ◽

2020 ◽

Author(s):

Mohammad Hasan Namaei ◽

Hengameh Hamzei ◽

Marzie Moghanni ◽

Azadeh Ebrahimzadeh

Keyword(s):

Escherichia Coli ◽

Urinary Tract Infection ◽

Urinary Tract ◽

Tract Infection ◽

Antibiotic Use ◽

M Gene ◽

Esbl Producer ◽

Accurate Identification ◽

E Coli ◽

Tract Infections

Abstract Background: Urinary Tract Infection (UTI) is the most common bacterial infection in the world. E. coli is the predominant Pathogen. This study evaluates the prevalence of ESBL in E. colis isolated from patients with urinary tract infections with phenotypic and genotypic methods.Methods: This descriptive-analytical study was done on 155 isolates of E. coli isolated from patients with urinary tract infection who had received the study consent. After accurate identification of E. coli strains. ESBL production for Escherichia coli isolates which are resistant to ceftriaxone or ceftazidime was evaluated by CDT method. TEM, SHV and CTX-M genes were identified by PCR.Results: The results showed that 30 strains from 155 strains of E. coli had ESBL. Strains of ESBL producer were more in males was lower in educated persons. 38.9% of ESBL producer had antibiotic use, 29.9% -producing Escherichia hospitalization and 31.6% uti history. The highest level of drug allergy in the ESBL was related to nitrofurantoin, and the highest resistance was related to cefazolin, co-trimoxazole. The CTX-M and the CTX-M15 gene were found in 92.7% and 57.1% of cases, respectively; also the SHV and TEM genes were not found in any of ESBL-producing Escherichia coli strains. Most therapeutic response in patients was related to cefexime, ciprofloxacin and nitrofurantoin 27.4%, 26% 21.9%, respectively.Conclusion: This study showed that the history of antibiotic use, hospitalization, uti related to increase of ESBL-producing in E. coli isolates., the CTMX-M gene is the most common gene in ESBL-producing E. coli strains.

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Prevalence, Antimicrobial Susceptibility Pattern of Bacterial Isolates, and Associated Factors of Urinary Tract Infections among HIV‐Positive Patients at Hiwot Fana Specialized University Hospital, Eastern Ethiopia

Canadian Journal of Infectious Diseases and Medical Microbiology ◽

10.1155/2019/6780354 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8

Author(s):

Dadi Marami ◽

Senthilkumar Balakrishnan ◽

Berhanu Seyoum

Keyword(s):

Urinary Tract Infection ◽

Urinary Tract ◽

Tract Infection ◽

Antimicrobial Susceptibility ◽

University Hospital ◽

Hiv Positive ◽

Bacterial Isolates ◽

E Coli ◽

Antimicrobial Susceptibility Pattern ◽

Tract Infections

Urinary tract infection remains a major public health problem in developing countries, where there are limited health-care services. Its prevalence is fueled by human immunodeficiency virus (HIV) infection. The emergence of antimicrobial resistance is now widespread and poses a serious clinical threat. This study investigated the prevalence, antimicrobial susceptibility pattern of bacterial isolates, and associated factors of urinary tract infections among HIV-positive adult patients. A cross-sectional study was conducted among 350 randomly selected HIV-positive patients at Hiwot Fana Specialized University Hospital from February to March 2016. Data were collected using a structured questionnaire. Clean-catch midstream urine samples were collected aseptically and examined using the recommended culture methods. Antimicrobial susceptibility testing was performed using the Kirby–Bauer disk diffusion technique. Data were analyzed using Statistical Package for the Social Sciences version 21.0. The logistic regression models were used to explore the predictors of the outcome. A p value < 0.05 was considered statistically significant. The overall prevalence of urinary tract infection was 18% (95% CI: 15.34–22.63). Individuals with age 35–44 years (Adjusted odds ratio (AOR): 4.07; 95% CI: 1.09, 5.10), income less than 46.7 USD (AOR: 2.76; 95% CI: 1.15, 6.07), and a CD4+ count less than 200 cells/mm3 (AOR: 2.07; 95% CI: 1.15, 3.73) had higher odds of UTI. Escherichia coli (38.1%), Klebsiella pneumoniae (23.8%), and Staphylococcus aureus (11.1%) were the predominant causes of urinary tract infection. E. coli was resistant to ampicillin (95.8%), ceftazidime (95.8%), cotrimoxazole (95.8%), amoxicillin (91.7%), ceftriaxone (87.5%), and tetracycline (87.2%). Multidrug resistance was observed in 46% of the isolates. The prevalence of urinary tract infection in this study was high compared to the previous reports in Ethiopia. Age 35–44 years, income less than 46.7 USD, and a CD4+ count < 200 cells/mm3 increase the odds of urinary tract infection. The most common isolates were E. coli, K. pneumoniae, and S. aureus. Almost half of the isolates were multidrug resistant. Actions to help mitigate the further spread of resistance are urgently needed in the study area.

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An Approach to Uropathogenic Escherichia Coli in Urinary Tract Infections

Journal of Laboratory Physicians ◽

10.4103/0974-2727.72152 ◽

2010 ◽

Vol 2 (02) ◽

pp. 070-073 ◽

Cited By ~ 4

Author(s):

K Prabhat Ranjan ◽

Neelima Ranjan ◽

Arindam Chakraborty ◽

D R Arora

Keyword(s):

Escherichia Coli ◽

Urinary Tract ◽

Cell Surface ◽

Urinary Tract Infections ◽

Cell Surface Hydrophobicity ◽

Surface Hydrophobicity ◽

Uropathogenic Escherichia Coli ◽

Virulence Markers ◽

The Difference ◽

Tract Infections

ABSTRACT Purpose: To study the occurrence and characterization of Uropathogenic Escherichia coli (UPEC) in cases with urinary tract infections. Materials and Methods: A total of 220 symptomatic cases from urinary tract infections and 50 stool samples from apparently healthy individuals were included. The colonies identified as Escherichia coli were screened for virulence factors, that is, hemolysin, Mannose Resistant and Mannose Sensitive Hemagglutination (MRHA, MSHA), Cell surface hydrophobicity, and Serum resistance. Results: Among the 220 cases 91 (41.36%) were hemolytic, 68 (30.90%) showed MRHA, 58 (26.36%) were cell surface hydrophobicity positive, and 72 (32.72%) were serum-resistant. In 50 controls, three (6%) were hemolytic, six (12%) showed MRHA, nine (18%) showed cell surface hydrophobicity, and 12 (24%) were serum-resistant. The difference between cases and controls for hemolysis and MRHA were significant (P<0.001 and P<0.01, respectively). A total of 14 atypical E. coli were isolated from the urine and all showed the presence of one or the other virulence markers. Out of the 18 mucoid E.coli isolated, 10 were serum-resistant. Conclusions: The present study revealed that out of 220 urinary isolates, 151 could be labeled as UPEC.

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Escherichia coli Isolates That Carryvat,fyuA,chuA, andyfcVEfficiently Colonize the Urinary Tract

Infection and Immunity ◽

10.1128/iai.00752-12 ◽

2012 ◽

Vol 80 (12) ◽

pp. 4115-4122 ◽

Cited By ~ 90

Author(s):

Rachel R. Spurbeck ◽

Paul C. Dinh ◽

Seth T. Walk ◽

Ann E. Stapleton ◽

Thomas M. Hooton ◽

...

Keyword(s):

Escherichia Coli ◽

Urinary Tract Infection ◽

Urinary Tract ◽

Tract Infection ◽

Virulence Factors ◽

Neonatal Meningitis ◽

Content Type ◽

E Coli ◽

Core Set ◽

Encoding Genes

ABSTRACTExtraintestinalEscherichia coli(ExPEC), a heterogeneous group of pathogens, encompasses avian, neonatal meningitis, and uropathogenicE. colistrains. While several virulence factors are associated with ExPEC, there is no core set of virulence factors that can be used to definitively differentiate these pathotypes. Here we describe a multiplex of four virulence factor-encoding genes,yfcV,vat,fyuA, andchuA, highly associated with uropathogenicE. colistrains that can distinguish three groups ofE. coli: diarrheagenic and animal-associatedE. colistrains, human commensal and avian pathogenicE. colistrains, and uropathogenic and neonatal meningitisE. colistrains. Furthermore, human intestinal isolates that encode all four predictor genes express them during exponential growth in human urine and colonize the bladder in the mouse model of ascending urinary tract infection in higher numbers than human commensal strains that do not encode the four predictor genes (P= 0.02), suggesting that the presence of the predictors correlates with uropathogenic potential.

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ANTIBIOTIC SUSCEPTIBILITY OF ESCHERICHIA COLI ISOLATE FROM URINARY TRACT INFECTION OF THALASSEMIC PATIENTS IN THI-QAR PROVINCE

Southern Brazilian Journal of Chemistry - Southern Brazilian Journal of Chemistry, Volume 28, No. 28, 2020 ◽

10.48141/sbjchem.v28.n28.2020.04_okab_pgs_22_33.pdf ◽

2020 ◽

Vol 28 (28) ◽

pp. 22-33

Author(s):

Alaa Abood Yasir OKAB ◽

Manal B SALIH

Keyword(s):

Escherichia Coli ◽

Urinary Tract Infection ◽

Urinary Tract ◽

Tract Infection ◽

Clavulanic Acid ◽

Rural Areas ◽

Antibiotic Resistant ◽

E Coli ◽

Amoxicillin Clavulanic Acid ◽

Tract Infections

Escherichia coli (E. coli) is the most common type of pathogen that causes Urinary tract infection disease. It can be presented as a pathogenic or non-pathogenic strain and found not only in the animal but also in the human intestine. This bacterium can cause opportunistic infection when the human host comprised of thalassemia patients or changes the healthy hemostatic flora. This study aimed to analyze the presence of bacteria in thalassemia patients with urinary tract infection. A total of 303 samples were collected during the period from August 2019 to January 2020 from thalassemia patients who suffered from urinary tract infection. The results showed that there were 6.9% of patients infected with E. coli, 2.6% of patients were infected with S. aureus, 0.7% with both Proteus and Klebsiella, while 89.1% of patients had a negative sample for bacteria. Also, the incidence of urinary tract infections in females is higher than in males. Besides, its occurrence in rural areas is higher than in city residents. Moreover, among 16 antibiotics tested to sensitize bacteria to antibiotics, Imipenem showed 100% efficacy on all isolated bacteria. In contrast, Netilmicin showed 80.1% efficacy, Gentamycin 80.1%, and Amikacin 76.2%. Ampicillin, Aztreonam, Amoxicillin-Clavulanic Acid, Tetracycline, and Ticarcillin-Clavulanic Acid, did not show any effectiveness toward the bacteria while other antibiotics showed different activities. Furthermore, the isolated microbes from thalassemia patients were the highest resistance to antibiotics in comparison with other studies, and this antibiotic-resistant may be due to the weakening of the patient's immune status and frequent blood taking and the antibodies it contains.

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Prevalence of blaCTX-M, blaSHV, and blaTEM Genes in Escherichia coli Strains Isolated From Urinary Tract Infection Samples of Patients in the Intensive Care Unit in Qom, Iran

Gene Cell and Tissue ◽

10.5812/gct.102700 ◽

2020 ◽

Vol 7 (2) ◽

Author(s):

Shima Sadat Lesani ◽

Mohammad Soleimani ◽

Pegah Shakib ◽

Mohammad Reza Zolfaghari

Keyword(s):

Escherichia Coli ◽

Drug Resistance ◽

Urinary Tract Infection ◽

Intensive Care ◽

Urinary Tract ◽

Tract Infection ◽

Intensive Care Units ◽

Diffusion Method ◽

E Coli ◽

Tract Infections

Background: Escherichia coli is considered as one of the causes of opportunistic infections. Nowadays, due to the increase in drug resistance, the treatment of these infections has become very difficult and they are recognized as the main causes of death in hospitalized patients. Objectives: The aim of this study was to determine the prevalence of blaTEM, blaSHV, and blaCTX-M genes in E. coli strains isolated from the urinary tract infection in patients in Intensive Care Units of three different hospitals in Qom, Iran. Methods: This study was conducted in three months from October to December 2014. A total of 200 E. coli samples were taken from the patients with urinary tract infections in Intensive Care units of Qom hospital. The disc diffusion method was used to determine the susceptibility pattern of antibiotic and phenotypic confirmatory tests for screening of the expanded spectrum beta-lactamase (ESBL) isolates. The presence of blaTEM, blaSHV, and blaCTX-M genes was evaluated by the polymerase chain reaction (PCR) assay. Results: Of 200 samples, ampicillin (96%) and nitrofurantoin (19.5%) showed the highest and lowest drug resistance, respectively. A total of 156 isolates (78%) were identified as ESBLs using the phenotypic method. Moreover, 76 (38%), 90 (45%), and 123 (61.5%) isolates consisted of blaCTX-M, blaSHV, and blaTEM, respectively. Conclusions: Overall, the findings of this study showed that blaTEM was the most common gene with a frequency of 61.5% in ESBL E. coli.

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