Medical Journal of Tabriz University of Medical Sciences and Health Services

Med J Tabriz Uni Med Sciences Health Services. 2020;42(1): 48-55.
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Original Article

Investigation of frequency of agr genes and determination of drug resistance pattern in Staphylococcus aureus strains isolated from clinical samples in Tabriz hospitals in 2017

Abolfazl Jafari Sales 1 ORCID logo, Yashar Bagherizadeh Tavakoli 1 ORCID logo, Afsoon Shariat 2* ORCID logo

1 1Student of Microbiology, Department of Microbiology, Faculty of Basic Sciences, Islamic Azad University, Kazerun Branch, Kazerun, Iran.
2 Department of Microbiology, Faculty of Basic Sciences, Islamic Azad University, Kazerun Branch, Kazerun, Iran.
*Corresponding author; E-mail: afsoonsh1980@yahoo.com

Abstract

Background: Staphylococcus aureus (S. aureus) is major cause of nosocomial infections. The accessory gene regulator (agr) system of Staphylococcus aureus controls the expression of the genes encoding extracellular virulence factors. The aim of this study was to investigate the frequency of agr genes and drug resistance in Staphylococcus aureus strains isolated from clinical samples in Tabriz hospitals.

Methods: This cross-sectional study was done among a total of 100 strains isolated from clinical samples in Tabriz hospitals. Antibiotic susceptibility pattern of all isolates was determined by disk diffusion method. After DNA extraction, the presence of agr genes was investigated using Multiplex PCR. SPSS software was used to perform statistical tests.

Results: Among 100 Staphylococcus aureus strains, 38 isolates were resistant to methicillin. They were susceptible to rifampin (89%) and vancomycin (86%) but showed resistance to penicillin (98%) and tetracycline (85%). The most prevalent gene was agrA (65%) followed by the agrC (29%) in strains. None of the isolates harbored the agrB and agrD genes.

Conclusion: agrA and agrC genes play an important role in staphylococcal infections in clinical samples isolated from Tabriz hospitals. Also, the results showed high rates of multi-drug resistance in Staphylococcus aureus strains isolated from Tabriz hospitals. Therefore, it is recommended to limit the unnecessary uses of antibiotics.

Keywords: Staphylococcus Aureus, Agr Genes, Drug Resistance, Tabriz Hospitals
How to cite this article: Jafari Sales A, Bagherizadeh Tavakoli Y, Shariat A. [Investigation of frequency of agr genes and determination of drug resistance pattern in Staphylococcus aureus strains isolated from clinical samples in Tabriz hospitals in 2017]. Med J Tabriz Uni Med Sciences Health Services. 2020 April- May; 42(1):48-55. Persian.
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Submitted: 07 Apr 2018
ePublished: 26 Feb 2020
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