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ANTIBIOTICS SUSCEPTIBILITY OF AEROSOLIC BACTERIA AND FUNGI ISOLATED FROM DIFFERENT LABORATORY ENVIRONMENT IN OLABISI ONABANJO UNIVERSITY
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Table of contents
CHAPTER ONE 1
1.1 Introduction 1
1.2 Aim of the Study 3
1.3 Objective of the Study 3
CHAPTER TWO: Literature Review 4
2.1 Antibiotic Resistance 4
2.2 Indoor Air Quality 5
2.3 Indoor Air Pollution 6
2.4 Microbes in Indoor Environments 7
2.5 Microbial Growth on Building Materials 9
2.6 Effects of Remediation on Microbial Indoor Environment Quality 11
2.7 Bacterial Resistance to Antimicrobial Agents 12
CHAPTER THREE: Materials and Methods 13
3.0 Study Area 13
3.1 Collection of Samples 13
3.2 Instrument and glass wares 13
3.3 Media Used 14
3.4 Method of Sterilization 14
3.5 Collection of Samples and Isolation of Microorganism from Indoor Air Samples
in Laboratories 14
3.6 Characterization of Bacterial Isolates 15
3.6.1 Gram's Staining Reaction 15
3.6.2 Catalase 16
3.6.3 Oxidase Test 16
3.6.4 Indole Test 16
3.6.5 Citrate Test 16
3.6.6 Coagulase Test 17
3.6. 7 Urease Test 17
3.6.8 Sugar Fermentation Test 17
3.7 Identification of Fungi 18
3.8 Antibiotic Susceptibility Testing of Bacterial Isolates 18
3.8.1 Preparation of Inoculum 18
CHAPTER FOUR: Results 19
Table 4.1 Total Viable Count of Bacteria Isolated From Laboratories in OOU 21
Table 4.2 Morphological Characteristics of Bacteria Isolated from Olabisi Onabanjo
University Laboratories 22
Table 4.3 Biochemical Characterization of Bacteria Isolated from Olabisi Onabanjo University Laboratories 23
Table 4.4 Cultural and Morphological Characteristics of Fungi identified in the major
laboratories of the Faculty of Science, Olabisi Onabanjo University 24
Table 4.5 Zone of Inhibition of Antibiotics Susceptibility Test Performed on the
Isolates (mm) 25
CHAPTER FIVE: Discussion, Conclusion and Recommendations 27
5.1 Discussion 27
5.2 Conclusion 28
5.3 Recommendations 29
References 30
Abstract
A study on Indoor Air Quality of university laboratories is important because people spend most of their time inside laboratories, especially during practical period. This study was carried out to isolate and characterize aerosolic bacteria and fungi from different laboratory environments in the Faculty of Science, Olabisi Onabanjo University. The air sample was collected by exposing prepared and solidified nutrient agar and potato dextrose agar. Bacteria were enumerated on nutrient agar and fungi were enumerated on potato dextrose agar. The bacteria counts of air samples ranged from 6 to 144 cfu/m3. The bacteria count (6 cfu/m3) was observed in Zoology laboratory whereas the highest bacteria count (144 cfu/m3) was observed in Microbiology Laboratory. Thirty bacteria isolates belonging to four genera were isolated from the sample laboratories; Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus subtilis and Micrococcus luteus. Out of the thirty bacteria isolated in this study, fifty-three (53%) were susceptible to Septrin, followed by Ciprofloxacin and Streptomycin with 47%, Erythromycin and Pefloxacin with 40%, Gentamycin with 23%. The least susceptible was Ampiclox, Zinnacef and Amoxicillin with 10% each. Fungi isolated were Aspergillus niger, Aspergillus nidulans and Rhizophores stolonifera. The reason for high microbial load in the microbiology laboratory might be due to crowds during the collection of sample. This study therefore concluded that university laboratory are not conducive for students. It is therefore suggested that school management should ensure that the laboratories follows the set standard of Hazard Analysis and Critical Control Point (HACCP).
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