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Introduction: Antibiotic resistance in Pseudomonas aeruginosa has become a worldwide problem, and is leading to multi-drug resistance (MDR: Multiple drug resistance). Therefore, this study aimed to determine the antibiotic strain patterns of Pseudomonas aeruginosa isolated from various clinical specimens of patients in hospitals in Yazd. Methods: In this descriptive cross- sectional study, 90 isolates of pseudomonas aeruginosa derived from different clinical samples was transferred to the microbiology lab of Shahid Sadoughi University of Medical Sciences in Yazd in 2013. Conventional biochemical tests were utilized to confirm the presence of bacteria, and then antibiotic resistance pattern was determined using standard disk diffusion (Kirby - Bauer) method according to the CLSI guideline. Results: Out of 90 isolates of Pseudomonas aeruginosa isolated from various clinical samples, burn wound specimens had the most antibiotic-resistant pattern. As a matter of fact, all of 28 strains isolated from burn wounds were MDR. Ceftazidime involved the most resistant antibiotic (56%), whereas ciprofloxacin was the least resistant one (44.4%), and 66.6% of the isolates were detected as multi-drug resistant. Conclusion: The prevalence of MDR Pseudomans aeruginosa in the present study was high. As ceftazidime, Ertapenem, and meropenem had effective anti Pseudomonal activity against MDR Pseudomans aeruginosa (in this study increased resistance to these antibiotics was observed), it is necessary to evaluate antibiotic susceptibility as well as to determine antibiotic pattern prior to starting the treatment in order to prevent antibiotic-resistant strains.

Keywords: Antibiotic, Hospital, Multiple drug resistance, Pseudomonas aeruginosa, Yazd

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