Emergence of extended‐spectrum β‐lactamase‐producing Escherichia coli and Klebsiella pneumoniae during the years 2000 and 2004 in Helsinki, Finland

Abstract The molecular epidemiology of 33 Escherichia coli and 81 Klebsiella pneumoniae extended-spectrum β -lactamase-producing health-care-associated and community-acquired isolates collected in the Helsinki district during 2000–2004 was investigated. Clonality studies, antimicrobial susceptibility and genotyping of the isolates were performed. Newly emerging CTX-M-producing E. coli and bla SHV-12 -producing K. pneumoniae isolates were detected. Clonal clusters of both species persisted throughout the study period.