Year :
2014
| Month :
April
| Volume :
8
| Issue :
4
| Page :
DC07 - DC09
Full Version
Accessory Gene Regulator Types of Staphylococcus aureus Isolated in
Gorgan, North of Iran
Published: April 1, 2014 | DOI: https://doi.org/10.7860/JCDR/2014/.4219
Meysam Hasannejad Bibalan, Fatemeh Shakeri, Naeme Javid, Amir Ghaemi, Ezzat Allah Ghaemi
1. Faculty, Department of Microbiology, Golestan University of Medical Sciences, Gorgon, Iran.
2. Faculty, Department of Microbiology, Golestan University of Medical Sciences, Gorgon, Iran.
3. Faculty, Department of Microbiology, Golestan University of Medical Sciences, Gorgon, Iran.
4. Assistant Professor, Department of Microbiology, Golestan University of Medical Sciences, Gorgon, Iran.
5. Professor, Department of Microbiology, Golestan University of Medical Sciences, Gorgon, Iran.
Correspondence Address :
Dr. Ezzat Allah Ghaemi,
Professor, Department of Microbiology, Golestan University of Medical Sciences, Gorgon, Iran.
Phone: +989122835601, E-mail: eghaemi@yahoo.com
Abstract
Background:Staphylococcus aureus is a gram-positive bacterium that has remained a persistent pathogen, causing infections such as endocarditis, meningitis, and toxic shock syndrome in humans. The accessory gene regulator (agr) system of Staphylococcus aureus is responsible for controlling the expression of many genes that code for virulence factors. In this study, we assessed the S.aureus agr Group, based on their source of isolation, in Gorgan, North of Iran.
Materials and Methods:DNA of 194 S. aureus isolates was extracted by lysozyme-phenol chloroform method, which included 85 clinical samples, 58 samples which were isolated from noses of health care workers and 51 cases which were obtained from food products in Gorgan, northern Iran. PCR-based assays were used to evaluate agr locus nucleotide polymorphism for the identification of agr speci fi city Group. Distributions of each agr Group were determined and comparison between different sources was assessed by X 2 . A p-value of <0.05 was considered as signi fi cant.
Results:The majority of isolates belonged to agr Group I (43.3%), followed by agr Group III (28.87%), agr Group II (22.68%), and agr Group IV (5.15%). In our study, a majority of S. aureus isolates were recovered from health care workers and food product specimens were of agr Group I and isolates which were recovered from patients were of agr Group III. These differences were statistically signi fi cant (P=0.005). There was no statistical difference between the source of isolation of clinical samples of S.aureus and agr type.
Conclusion:Agr Group I was predominant among health care workers and food product specimens in Gorgan, North of Iran, but in strains which were isolated from patients, agr Group III was predominant. Investigating the possible role of agr Group III in Staphylococcus aureus infection in future studies is recommended.
Keywords
S. aureus, Agr Group genes, PCR
DOI: 10.7860/JCDR/2014/6971.4219
FinanCial Or OtHer COMPetinG interests:None.
Date of Submission: Jul 15, 2013
Date of Peer Review: Jan 13, 2014
Date of Acceptance: Feb 15, 2014
Date of Publishing: Apr 15, 2014
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