Abstract
Background: Pseudomonas aeruginosa is one of the most important causes of opportunistic infections. Carbapenems are administrated for the treatment of resistant infections due to this bacterium. The aim of this study was to investigate the presence of blaSHV, blaTEM, blaCTX-M and blaOXA-48 beta-lactamase genes in clinical isolates of P. aeruginosa in Bandar Abbas, Iran. Methods: In this descriptive study, 96 isolates of P. aeruginosa were obtained from clinical samples in Bandar Abbas. All isolates were identified by biochemical tests. The antibiotic susceptibility was examined by disk diffusion method. The presence of blaCTX-M, blaSHV, blaTEM and blaOXA-48 genes was evaluated by polymerase chain reaction using a specific primer. Results: In this study, 76 isolates of P. aeruginosa (79.2%) were resistant to at least one carbapenem. The highest bacterial resistance (100%) was obtained to nalidixic acid (30 µg), followed by tetracycline (30 µg) and amoxicillin (25 µg). The frequencies of blaCTX-M, blaSHV, blaTEM and blaOXA-48 genes were 23.95% (23 isolates), 23.08% (26 isolates), 57.29% (55 isolates) and 12.5% (12 isolate), respectively. Sixty isolates resistant to carbapenems (78.9%) carried at least one resistant gene (blaTEM, blaSHV, blaCTX-M and blaOXA-48) and 16 isolates (21.1%) did not have any of these genes. Conclusions: This study revealed the prevalence of carbapenem-resistant phenotype of P. aeruginosa clinical isolates and the frequency of extended-spectrum β-lactamase genes have increased.
Highlights
Pseudomonas aeruginosa is one of the most important causes of opportunistic infections
Many isolates of P. aeruginosa are susceptible to cephalosporins and carbapenems; this bacterium has acquired resistance to these antibiotics
The aim of this study was to investigate the presence of blaSHV, blaTEM, blaCTX-M and blaOXA-48 beta-lactamase genes in the clinical isolates of P. aeruginosa in Bandar Abbas, Iran
Summary
Pseudomonas aeruginosa is one of the most important causes of opportunistic infections. The aim of this study was to investigate the presence of blaSHV, blaTEM, blaCTX-M and blaOXA-48 beta-lactamase genes in clinical isolates of P. aeruginosa in Bandar Abbas, Iran. Methods: In this descriptive study, 96 isolates of P. aeruginosa were obtained from clinical samples in Bandar Abbas. Conclusions: This study revealed the prevalence of carbapenem-resistant phenotype of P. aeruginosa clinical isolates and the frequency of extended-spectrum β-lactamase genes have increased. Many isolates of P. aeruginosa are susceptible to cephalosporins and carbapenems; this bacterium has acquired resistance to these antibiotics. The prevalence of resistance to carbapenems among P. aeruginosa isolates is a common challenge facing the successful treatment of the life-threatening and permanent infections due to this bacterium [6,7]
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