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Psychrobacter isolates of human origin, other than Psychrobacter phenylpyruvicus, are predominantly Psychrobacter

Pieter Deschaght1, Michèle Janssens2, Mario Vaneechoutte1

  • 1Laboratory Bacteriology Research (LBR), Department Clinical Chemistry, Microbiology, Immunology, University of Ghent, Ghent, Belgium.

International Journal of Systematic and Evolutionary Microbiology
|May 10, 2011
PubMed

Insights

Most human Psychrobacter isolates, previously identified as Psychrobacter immobilis, are actually Psychrobacter faecalis or Psychrobacter pulmonis. This reclassification impacts bacterial identification and understanding of human-associated Psychrobacter species.

Area of Science:

  • Microbiology
  • Bacterial Taxonomy
  • Clinical Diagnostics

Background:

  • Human-associated Psychrobacter isolates are frequently misidentified.
  • The species Psychrobacter immobilis is commonly assigned to human isolates.
  • Accurate bacterial identification is crucial for clinical and research purposes.

Purpose of the Study:

  • To re-evaluate the taxonomic classification of human Psychrobacter isolates.
  • To determine the correct species designation for isolates currently identified as Psychrobacter immobilis.
  • To clarify the composition of human-associated Psychrobacter populations.

Main Methods:

  • Phenotypic characterization of bacterial isolates.
  • Genotypic analysis (e.g., sequencing) for precise identification.
  • Review of bacterial strains held in culture collections.

Main Results:

  • A significant proportion of human Psychrobacter isolates, previously designated P. immobilis, were reclassified.
  • The majority of these reclassified isolates were identified as Psychrobacter faecalis.
  • A substantial number were also identified as Psychrobacter pulmonis.

Conclusions:

  • The predominant species among human Psychrobacter isolates is not P. immobilis, contrary to previous assumptions.
  • Human isolates previously labeled P. immobilis are more accurately identified as P. faecalis and P. pulmonis.
  • This finding necessitates a revision of bacterial databases and diagnostic approaches for human-associated Psychrobacter.

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