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Occurrence of sessile Pseudomonas oryzihabitans from a karstified chalk aquifer

L Dussart1, J-P Dupont, I Zimmerlin

  • 1Department of Geology, UMR 6143 CNRS, University of Rouen, 76821 Mont-Saint-Aignan Cedex, France.

Water Research
|February 26, 2003
PubMed

Insights

Pseudomonas oryzihabitans, a waterborne pathogen, adheres to particles in karst groundwater. These biofilms show increased chlorine resistance, suggesting a source for opportunistic infections and impacting water purification.

Area of Science:

  • Environmental Microbiology
  • Waterborne Pathogens
  • Biofilm Formation

Background:

  • Pseudomonas oryzihabitans is an uncommon opportunistic pathogen.
  • The environmental source of human P. oryzihabitans infections remains poorly documented.

Purpose of the Study:

  • To investigate the presence of P. oryzihabitans in karst groundwater.
  • To assess the biofilm formation and chlorine resistance of P. oryzihabitans.

Main Methods:

  • Isolation of P. oryzihabitans from suspended particulate matter in karst groundwater.
  • Biofilm formation assays on silicon supports and clay beads.
  • Chlorine resistance testing of adherent versus planktonic cells.

Main Results:

  • P. oryzihabitans was found adhering to suspended particulate matter in karst groundwaters.
  • The pathogen formed biofilms on various surfaces and exhibited enhanced chlorine resistance.
  • Adherent bacteria were significantly more resistant to chlorine than planktonic cells.

Conclusions:

  • Aquifer biofilms serve as potential environmental reservoirs for waterborne P. oryzihabitans infections.
  • Bacterial attachment and biofilm formation may compromise drinking water purification processes.

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