Nosocomial urosepsis caused by Enterobacter kobei with aberrant phenotype

Diagn Microbiol Infect Dis. 2005 Oct;53(2):143-7. doi: 10.1016/j.diagmicrobio.2005.06.008. Epub 2005 Sep 15.


Enterobacter kobei is the species of the Enterobacter cloacae complex, which is phenotypically most closely related to the species E. cloacae. This is the first report of infection caused by a new biotype of E. kobei. A patient with a history of urinary bladder operation developed a urosepsis with an Enterobacter isolate displaying the E. cloacae phenotype. The isolate was classified to the species E. kobei by sequence analysis of the 16S-rDNA, 4 protein-coding genes and enterobacterial repetitive intergenic consensus (ERIC)-cluster analysis. E. kobei was originally described to be Voges-Proskauer (VP) negative. However, the isolates of the present case were VP-positive. After analyzing 120 biochemical tests included in the API20E and the Biotype 100 systems, 4 biochemical tests were identified potentially differentiating this new biotype from E. cloacae.

Publication types

  • Case Reports
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cross Infection / microbiology*
  • Cross Infection / transmission
  • Enterobacter cloacae / classification*
  • Enterobacter cloacae / genetics
  • Enterobacteriaceae Infections / microbiology*
  • Enterobacteriaceae Infections / transmission
  • Female
  • Humans
  • Middle Aged
  • Neoplasms, Squamous Cell / complications
  • Phenotype
  • Phylogeny
  • RNA, Ribosomal, 16S / analysis
  • RNA, Ribosomal, 16S / genetics
  • Sequence Analysis, DNA


  • RNA, Ribosomal, 16S