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Antibiotics susceptibility and the presence of blaIMP and blaVIM genes among of Pseudomonas aeruginosa strains resistant or susceptible to imipenem

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Sacha P., Wieczorek P., Ojdana D., Jaworowska J., Kaczyńska K., Bajguz A., Tryniszewska E.
Progress in Health Sciences
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2012
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vol. 2
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issue 1
12-18
EN
Introduction: Pseudomonas aeruginosa rods are increasingly causing serious infections in hospitalized patients. Particularly worrying is the increase of resistance to carbapenems antibiotics. Purpose: To evaluate susceptibility and the occurrence of genes (blaIMP and blaVIM) encoding resistance to carbapenems among Pseudomonas aeruginosa strains. Materials and methods: Studies were conducted for 50 strains of Pseudomonas aeruginosa (25 susceptible and 25 resistant to imipenem). Susceptibility to antibiotics was tested using the diffusion method and discs with antibiotics and / or strips with gradient concentrations of antibiotics. In the second phase we tested the ability of MBL production by all strains using the CD and DDST technique described in the literature. The next stage of the study was to evaluate the prevalence of carbapenems resistance genes. These studies were performed by PCR technique. Results: The studies found in both groups of Pseudomonas aeruginosa rods similar percentage of strains resistant to aminoglycoside antibiotics (from 72% to 88%) and ciprofloxacin (84%). There was no presence of the genes in any of the tested groups of Pseudomonas aeruginosa. Conclusion: Pseudomonas aeruginosa strains resistant to imipenem no posses blaIMP and blaVIM genes therefore their resistance was conditioned by the presence of other mechanisms. Antibiotics with high activity against Pseudomonas aeruginosa strains resistant to imipenem were polymyxin B (100% susceptible strains) and colistin (96% susceptible strains).
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