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ASSESSMENT OF Escherichia coli FROM URINE OF UNIVERSITY STUDENTS FOR BIOFILM PRODUCTION
Categories
Table of contents
CHAPTER ONE 1
1.1 Introduction 1
1.2 Aims and Objectives 6
1.3 Objective of the study 6
1.4 Literature Review 7
CHAPTER TWO: Materials and Methods 10
2.1 Samples Collection 10
2.2 Sterilization of Materials 10
2.3 Preparation of Culture Media 10
2.4 Isolation of Escherichia Coli 11
2.5 Characterization and Identification of Bacteria 11
2.5.1 Cultural and Morphological Characteristics 12
2.5.2 Gram Stain Reaction 12
2.6 Identification Methods 13
2.6.1 Urease Test 13
2.6.2 Indole Test 13
2.6.3 Oxidase Test 14
2.6.4 Catalase Test 14
2.6.5 Citrate Utilization Test 14
2.6.6 Motility Test 15
2.6.7 Voges-Proskauer (VP) Test 15
2.7 Biofilm Formation Assay of Escherichia coli 16
2.7.1 Test Tube Method 16
2.7.2 Tissue culture Plate Method 16
CHAPTER THREE 18
3.1 Results 18
CHAPTER FOUR: Discussion and Conclusion 28
4.1 Discussion 28
4.2 Conclusion and Recommendations 30
References 32
LIST OF TABLES
List Title Page
3.1 Isolation rate of Escherichia coli and Other Microorganisms
Isolated from Urine Samples 20
3.2 Biochemical Characterization of Bacterial Isolated from Urine
Samples 21
3.3 Results of Test Tube Method used for Assessment of E. coli for
Biofilm Production 22
3.4 Results of Biofilm Production of different E. coli by Microtiter Plate
Method 23
3.5 Correlation between Biofilm Produced by E. coli with Microtiter
Plate Method and Tube method 24
LIST OF FIGURES
List Title Page
3.1 Typical isolate of E. coli showing metallic sheen colonies on Eosin
Methylene Blue agar 25
3.2 Screening of E. coli for Biofilm Production by Test Tube Method 26
3.3 Screening of E. coli for Biofilm Production by Microtiter Plate Method 27
Abstract
Escherichia coli is one of the most frequent pathogenic bacteria isolated from urine samples and they are able to attach to the bladder wall and form a biofilm that contribute to virulence of bacteria which resist the body’s immune response. This study was conducted to assess Escherichia coli from urine of university students for biofilm production. 60 urine samples were collected from students of Olabisi Onabanjo University into a sterile universal bottle and transported to the Department of Microbiology laboratory for immediate culture on Eosin Methylene Blue agar. The bacteria isolates were examined and characterized biochemically using standard microbiological method. E. coli was found to be the most frequent isolated pathogen (n=12, 20%), followed by Klebsiella spp. (n=10, 16.6%), E. coli / P. aeruginosa (n=6, 10%), Pseudomonas aeruginosa (n=5, 8.3%) and Proteus mirabilis (n=3, 5%). Out of the Eighteen (18) E. coli subjected to biofilm production, 16 (88.8%) isolates produced biofilm by TCP method and 13(72.2%) produced biofilm by Tube Method. Presence of this pathogen in urine tract may lead to multiplication and establishment of urinary tract infection which females are more prone to than males. The ability of E. coli to form a biofilm which resists the body’s immune response may pose a public health problem for the host patients as the microorganisms in biofilm contribute to virulence of bacteria that are difficult to treat with antimicrobial agents. Good knowledge and proper education should be made known to the students and general populace on urinary tract infections and the causes.
Keyword: Escherichia coli, Biofilm formation, Urine
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