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Journal of Clinical Microbiology
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Bacteriology

Identification of Clinical Isolates of Indole-Positive and Indole-Negative Klebsiella spp.

Maria Silvana Alves, Rubens Clayton da Silva Dias, Angela Christina Dias de Castro, Lee W. Riley, Beatriz Meurer Moreira
Maria Silvana Alves
1Faculdade de Farmácia e Bioquímica, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais
2Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
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Rubens Clayton da Silva Dias
2Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
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Angela Christina Dias de Castro
2Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
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Lee W. Riley
3School of Public Health, University of California, Berkeley, California
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Beatriz Meurer Moreira
2Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
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  • For correspondence: bmeurer@micro.ufrj.br
DOI: 10.1128/JCM.00940-06
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ABSTRACT

Biochemical methods employed to classify bacterial species have limitations and may have contributed to the taxonomic complexity recently reported for the genus Klebsiella. The objective of the present study was to apply a simple biochemical test panel to classify a collection of human Klebsiella isolates. We found that with only three additional tests, it is possible to place most isolates in a defined species. Analysis of a 512-bp sequence of the rpoB gene was used as the reference. A total of 16 conventional and 4 supplementary tests were used to evaluate 122 recent isolates identified as Klebsiella from 120 patients, isolated at the clinical laboratory of a university hospital in Minas Gerais, Brazil. Of these, 102 (84%) isolates were identified as Klebsiella pneumoniae or Klebsiella variicola, 19 (15%) as Klebsiella oxytoca, and 1 (1%) as Raoultella planticola. Enterobacterial repetitive intergenic consensus-PCR typing revealed a diversity of genotypes. rpoB gene sequencing confirmed the phenotypic identification and detected five K. variicola isolates among the K. pneumoniae/K. variicola group. Three additional tests that include growth at 10°C and histamine and d-melezitose assimilation should be considered essential tests for the typing of Klebsiella isolates.

  • Copyright © 2006 American Society for Microbiology
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Identification of Clinical Isolates of Indole-Positive and Indole-Negative Klebsiella spp.
Maria Silvana Alves, Rubens Clayton da Silva Dias, Angela Christina Dias de Castro, Lee W. Riley, Beatriz Meurer Moreira
Journal of Clinical Microbiology Oct 2006, 44 (10) 3640-3646; DOI: 10.1128/JCM.00940-06

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Identification of Clinical Isolates of Indole-Positive and Indole-Negative Klebsiella spp.
Maria Silvana Alves, Rubens Clayton da Silva Dias, Angela Christina Dias de Castro, Lee W. Riley, Beatriz Meurer Moreira
Journal of Clinical Microbiology Oct 2006, 44 (10) 3640-3646; DOI: 10.1128/JCM.00940-06
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KEYWORDS

Bacterial Typing Techniques
Indoles
Klebsiella

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