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To investigate the epidemiology and to characterize the resistance mechanisms of the isolates, a study was initiated. Antibiotic susceptibility was determined by means of the Etest and the disc diffusion method. Extended\u2010spectrum beta\u2010lactamase (ESBL) production was identified by clavulanic acid synergy test and confirmed with PCR amplification followed by DNA sequencing. DNA profiles of the isolates were examined with pulsed\u2010field gel electrophoresis (PFGE). All isolates were resistant or exhibited reduced susceptibility to cefadroxil, cefuroxime, cefotaxime, ceftazidime, aztreonam, piperacillin\/tazobactam, ciprofloxacin, tobramycin, and trimethoprim\u2010sulfamethoxazole. They produced ESBL of the CTX\u2010M\u201015 type, and the involvement of a single <jats:italic>K. pneumoniae <\/jats:italic>clone was shown. This is the first major clonal outbreak of multiresistant ESBL\u2010producing <jats:italic>K. pneumoniae <\/jats:italic>in Scandinavia. 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