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Characteristics of Pseudomonas aeruginosa isolates from intensive care unit

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Ozer B., Tatman-Otkun M., Memis D., Otkun M.
Open Medicine
|
2009
|
vol. 4
|
issue 2
156-163
EN
The study looked at the antimicrobial resistance patterns, serotypes, molecular types, metallo beta-lactamase, and chromosomal betalactamase enzymes of P. aeruginosa strains isolated from the patients and the staffs of the intensive care unit. P. aeruginosa isolates from the patients as nosocomial pathogens and from the staffs were evaluated for their susceptibilities to the antimicrobials by the disk diffusion and E-test methods. Metallo beta-lactamase enzymes were investigated by E-test, the inducibility of β - lactamase enzymes were detected by the disk antagonism test. Serotyping was performed by slide agglutination method. The P. aeruginosa isolates were typed by pulsed field gel electrophoresis. Twenty-five P. aeruginosa strains from the patients and three from the staffs were isolated. Fifteen P. aeruginosa, eleven of which composed of MDR bacteria, were found in serogroup E, 7 strains in G, 4 strains in B, and 1 strain in serogroup A. In all 12 bacteria in the MDR and serogroup E, metallo beta-lactamase enzyme was found to be positive. And in other 15 strains, except the bacterium which could not be serotyped, chromosomal beta-lactamase was found to be positive. The result of the molecular typing showed PFGE A pattern. In conclusion, a pattern in PFGE which included bacteria from MDR and serogroup E, G which was observed in the P. aeruginosa strains which was isolated from the staff’s hands and from the 5 patients, and PFGE F pattern were found to be observed the most. Finally, the two different clonal strains were found to be established in the intensive care.
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