alexa Identification of clinical isolates of indole-positive and indole-negative Klebsiella spp.
Microbiology

Microbiology

Journal of Microbial & Biochemical Technology

Author(s): Alves MS, Dias RC, de Castro AC, Riley LW, Moreira BM

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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 degrees C and histamine and d-melezitose assimilation should be considered essential tests for the typing of Klebsiella isolates.
This article was published in J Clin Microbiol and referenced in Journal of Microbial & Biochemical Technology

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