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Journal of Clinical Microbiology, 03 1996, 564-568, Vol 34, No. 3
Copyright © 1996 by the American Society for Microbiology. All rights reserved.

Molecular epidemiology of Klebsiella pneumoniae producing SHV-5 beta- lactamase: parallel outbreaks due to multiple plasmid transfer

WM Prodinger, M Fille, A Bauernfeind, I Stemplinger, S Amann, B Pfausler, C Lass-Florl and MP Dierich
Institut fur Hygiene, University of Innsbruck, Austria. wolfgang.prodinger@uibk.ac.at

Over a period of 22 months, 32 patients treated in three independent intensive care units of the Innsbruck University Hospital were infected with extended-spectrum beta-lactamase-producing members of the family Enterobacteriaceae (30 Klebsiella pneumoniae isolates, 1 Klebsiella oxytoca isolate, and 1 Escherichia coli isolate). As confirmed by sequencing of a bla gene PCR fragment, all isolates expressed the SHV-5- type beta-lactamase. Genomic fingerprinting of epidemic strains with XbaI and pulsed-field gel electrophoresis grouped 20 of 21 isolates from ward A into two consecutive clusters which included 1 of 3 ward B isolates. All six K. pneumoniae isolates from ward C formed a third cluster. Stool isolates of asymptomatic patients and environmental isolates belonged to these clusters as well. Additionally, 2,600 routine K. pneumoniae isolates from the surrounding provinces (population, 900,000) were screened for SHV-5 production. Only one of six nonepidemic isolates producing SHV-5 beta-lactamase was matched with the outbreak strains by genomic fingerprinting. Plasmid fingerprinting, however, revealed the epidemic spread of a predominant R-plasmid, with a size of approximately 80 kb, associated with 29 of the 30 K. pneumoniae isolates. This plasmid was also present in the single K. oxytoca and E. coli isolates from ward C and in three nonepidemic isolates producing SHV-5. Our results underline that strain typing exclusively on the genomic level can be misleading in the epidemiological investigation of plasmid-encoded extended-spectrum beta- lactamases. Our evidence for multiple events of R-plasmid transfer between species of the family Enterobacteriaceae in this nosocomial outbreak stresses the need for plasmid typing, especially because SHV-5 beta-lactamase seems to be regionally spread predominantly via plasmid transfer.


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