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Background   Ralstonia pickettii  is a nosocomial infectious agent and a significant industrial contaminant. It has been found in many different environments including clinical situations, soil and industrial High Purity Water. This study compares the phenotypic and genotypic diversity of a selection of strains of  Ralstonia  collected from a variety of sources.    Results   Ralstonia  isolates (fifty-nine) from clinical, industrial and environmental origins were compared genotypically using i) Species-specific-PCR, ii) PCR and sequencing of the 16 S- 23 S  rRNA Interspatial region (ISR) iii) the  fliC  gene genes, iv) RAPD and BOX-PCR and v) phenotypically using biochemical testing. The species specific-PCR identified fifteen out of fifty-nine designated  R. pickettii  isolates as actually being the closely related species  R. insidiosa . PCR-ribotyping of the 16 S- 23 S  rRNA ISR indicated few major differences between the isolates. Analysis of all isolates demonstrated different banding patterns for both the RAPD and BOX primers however these were found not to vary significantly.    Conclusions   R. pickettii  species isolated from wide geographic and environmental sources appear to be reasonably homogenous based on genotypic and phenotypic characteristics.  R. insidiosa  can at present only be distinguished from  R. pickettii  using species specific PCR.  R. pickettii  and  R. insidiosa  isolates do not differ significantly phenotypically or genotypically based on environmental or geographical origin.

bmc microbiology

Genotypic and phenotypic diversity of Ralstonia pickettii and Ralstonia insidiosa isolates from clinical and environmental sources including High-purity Water. Diversity in Ralstonia pickettii