| Sumario: | Objective: Pseudomonas aeruginosa is one of the important nosocomial pathogens and resistant to many antibiotics including ?-lactams. PER-1 and OXA-10 type extended-spectrum ?-lactamases (ESBLs), the major ?-lactamases, were identified in P. aeruginosa. The aim of this study was to identify PER-1 (blaPER-1) and OXA-10 (blaOXA-10)-like ?-lactamases in ceftazidime- resistant nosocomial P. aeruginosa strains. Material and Methods: The presence of PER-1 and OXA-10 like ?-lactamases was investigated by polymerase chain reaction in 50 ceftazidime-resistant P. aeruginosa strains isolated from patients hospitalized in various clinics of Ondokuz May?s University, School of Medicine between 2007 and 2008. The PER and OXA-10-like ?-lactamases were analyzed by restriction fragment length polymorphism (RFLP) and followed by pulsed-field gel electrophoresis (PFGE) for the determination of clonal relationship of the strains. Results: The blaPER-1 gene and blaOXA-10 like gene were detected in 23 (46%) and 39 (78%) of the 50 of ceftazidime-resistant P. aeruginosa isolates, respectively. In addition, both of the two ß-lactamase genes were also detected in 12 (23%) of the isolates. PER-1 and OXA-10, -11, -14, -16 types were identified by RFLP analysis. Although the PFGE typing results yielded 11 different banding patterns, 74% (n= 37) of the all P. aeruginosa strains were included in four main patterns. Conclusion: It was concluded that the prevalence of PER-1 and OXA-10 enzymes was common among ceftazidime resistant P. aeruginosa isolates. PER-1 and OXA-10 enzymes produced the isolates were being transmitted horizontally as the most of the isolates were clonally related.
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