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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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