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. 1993 Feb;31(2):179–184. doi: 10.1128/jcm.31.2.179-184.1993

Molecular epidemiology of plasmid spread among extended broad-spectrum beta-lactamase-producing Klebsiella pneumoniae isolates in a pediatric hospital.

E H Bingen 1, P Desjardins 1, G Arlet 1, F Bourgeois 1, P Mariani-Kurkdjian 1, N Y Lambert-Zechovsky 1, E Denamur 1, A Philippon 1, J Elion 1
PMCID: PMC262731  PMID: 8432800

Abstract

Over a 12-month period, 43 children in eight different wards of our hospital (Hôpital Robert Debré) were infected or colonized with Klebsiella pneumoniae strains producing extended broad-spectrum beta-lactamases. The epidemiology of the outbreak was studied by a molecular approach including the determination of the beta-lactamase physicochemical parameters and plasmid profiles, as well as analysis of the restriction fragment length polymorphisms of the rDNA regions (ribotyping). The last approach produced 12 and 5 different patterns with EcoRI and HindIII, respectively, thus identifying 15 different ribotypes among the 43 clinical K. pneumoniae strains. However, 60% of the strains in six wards belonged to only two ribotypes, whereas nine ribotypes were observed only once. Twelve isolates from different wards that were representative of the eight most common ribotypes showed four different beta-lactamase isoelectric focusing patterns and seven different plasmid profiles by direct analysis or after EcoRI digestion. Thus, at least two genetically unrelated strains in the same ward were found to have the same plasmid content. Our results show the complexity of the outbreak, which was associated with patient-to-patient cross-contamination with several epidemic strains with different plasmid contents, interspersed sporadic cases with nonepidemic strains, and the possible spread of a plasmid. The combination of plasmid profile analysis and ribotyping therefore seems to be powerful at deciphering the details of such outbreaks.

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Selected References

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