Beta-lactamase Enzymes of Clinical Pseudomonas aeruginosa Strains.

Objectives In this study, the production of extended spectrum beta-lactamase (ESBL), metallo-betalacatamase (MBL) and AmpC beta-lactamase enzymes of Pseudomonas aeruginosa (P aeruginosa) strains which were isolated from clinical samples were investigated. AmpC gene was also detected by the polymerase chain reaction (PCR) analysis. Methods A hundred strains of P aeruginosa were included in the study. The presence of ESBL was investigated with combined disk confirmation test, MBL was investigated with E-test method and AmpC beta-lactamase was investigated with disk induction test. In order to detect the production of AmpC betalactamase genotypically, the PCR method was used. Results Only one strain was found to be MBL positive. Four per cent of strains were found to be ESBL positive. AmpC beta-lactamase production was positive in 73% of the strains with disk induction test. AmpC gene was detected in 96% of the studied strains with the PCR method. Conclusion While ESBL and MBL rates in this study were significantly lower than those found in other studies, the rate of AmpC beta-lactamase was higher. Although AmpC gene was detected in some strains (23%), they were not found to produce AmpC beta-lactamase with disk induction test.