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Time-Lapse Epifluorescence Microscopy Imaging of Pseudomonas aeruginosa and Staphylococcus aureus Heterogeneous Phenotypes

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Comparative study of 7 fluorescent pseudomonad clinical isolates.

A Chapalain¹, G Rossignol, O Lesouhaitier

¹Laboratoire de Microbiologie du Froid, UPRES 2123, Universite de Rouen, 55 rue Saint Germain, Evreux 27000, France.

Canadian Journal of Microbiology

|April 5, 2008

Summary

This study investigated Pseudomonas strains, finding that clinical Pseudomonas fluorescens showed varied adherence, while Pseudomonas mosselii exhibited significantly higher glial cell binding and potential virulence. This highlights diverse infectious mechanisms in these bacteria.

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Area of Science:

Microbiology
Bacteriology
Infectious Diseases

Background:

Pseudomonas fluorescens survival and infectious potential at elevated temperatures are debated due to strain variability.
Clinical isolates exhibiting growth above 37°C warrant investigation into their pathogenic mechanisms.

Purpose of the Study:

To identify and characterize clinical Pseudomonas strains capable of growth at or above 37°C.
To compare the glial cell binding and cytotoxic activities of these clinical strains with a reference strain.

Main Methods:

Polyphasic identification of seven clinical bacterial strains.
Assessment of glial cell binding indexes for identified strains.
Comparison of cytotoxic activities among clinical Pseudomonas isolates.

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Main Results:

Two strains were identified as Pseudomonas mosselii, and four as Pseudomonas fluorescens bv. I or II.
Clinical P. fluorescens strains displayed adherence similar to the reference strain P. fluorescens MF37.
P. mosselii strains demonstrated threefold greater glial cell binding compared to the reference strain.

Conclusions:

Clinical Pseudomonas strains exhibit diverse virulence mechanisms.
P. mosselii possesses higher adherence and potential virulence compared to P. fluorescens bv. I/II.
Findings suggest varying infectious potentials among clinical Pseudomonas isolates, including cytotoxic activity comparable to Pseudomonas aeruginosa.