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Year : 2018  |  Volume : 20  |  Issue : 2  |  Page : 88-91

Study of biofilm production in Escherichia coli causing urinary tract infection and its correlation with antimicrobial resistance

1 Department of Microbiology, All India Institute of Medical Sciences, Raipur, Chhattisgarh, India
2 Department of Microbiology, S.C.B. Medical College and Hospital, Cuttack, Odisha, India

Correspondence Address:
Dr. Debabrata Dash
Department of Microbiology, All India Institute of Medical Sciences, Raipur - 492 099, Chhattisgarh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jacm.jacm_35_17

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INTRODUCTION: Urinary tract infections (UTIs) are among the most common bacterial infections. Escherichia coli remains the most frequent cause of UTIs. More important is the increase in resistance to some antimicrobial agents. Furthermore, bacterial species are capable of living in a biofilm. There is increasing evidence for the role of bacterial biofilm in causing recurrent UTIs. AIM: The present study aimed to evaluate the ability of E. coli, isolated from UTIs to form a biofilm, and its association with catheterisation and to correlate the role of biofilms with their antimicrobial resistance. MATERIALS AND METHODS: A total of 403 urine samples were processed. All the isolated E. coli strains (226) were grown in Luria broth and were incubated overnight in high-glucose Dulbecco's modified Eagle's medium using a microtitre plate. The plate was stained with crystal violet, and the biofilm was quantified using an enzyme-linked immunosorbent assay plate reader at 570 nm. An optical density value more than that of the mean negative control plus three standard deviations is taken as positive for biofilm production. The antibiogram was done using the Kirby–Bauer disk diffusion method. RESULTS AND DISCUSSION: Of 226 strains, 54.4% were found to produce biofilms. Of them, 81.3% of patients were catheterised. Most of them were found to be resistant to commonly used antibiotics such as Cephalosporins, Quinolones and Aminoglycosides. Imipenem and Nitrofurantoin are the most effective antibacterial agents, showing 77.3% and 73.2% sensitivity, respectively. CONCLUSION: The biofilm assay using a microtitre plate is convenient and useful in screening the biofilm producers. Catheterisation is a risk factor for biofilm production, and catheter care is of paramount importance to prevent catheter-associated UTI.

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