The existence of Gram-negative bacilli producing metallo-β-lactamase has been increasingly reported in many countries. The polyresistant strains of Pseudomonas aeruginosa isolated from patients' urine were studied. The sensitiveness of strains to imipenem was assessed. The production of carbapenem-hydrolysing enzymes in resistant and moderately resistant strains was investigated. A high level of prevalence of the metallo-β-lactamase according to phenotypical test was showed. The necessity of

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... itoring of the distribution of carbapenem-hydrolysing enzymes producers is grounded.