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Comparative study of 7 fluorescent pseudomonad clinical isolates

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There is some debate about the potential survival of Pseudomonas fluorescens at temperatures above 37°C and its consequences for infectious potential, owing to the heterogeneity of clinical strains. Seven clinical strains growing at 37°C or more were submitted for polyphasic identification; 2 were identified as Pseudomonas mosselii and 4 were precisely characterized as P.fluorescens bv. I or II. The binding indexes on glial cells of the strains identified as P.fluorescens bv. I and P.mosselii were compared with that of a reference psychrotrophic strain, P.fluorescens MF37 (bv. V). Clinical P.fluorescens had a similar adherence potential range than strain MF37. Conversely, the binding indexes for P.mosselii strains were 3 times greater than that for strain MF37. These data, and those obtained by comparing the cytotoxic activities of P.fluorescens clinical strains, suggest the existence of different virulence mechanisms, leading either to a low infectious form or to a microorganism with cytotoxic activity in the same range as that of P.mosselii or even Pseudomonas aeruginosa.

Il existe un certain débat sur le potentiel de survie de Pseudomonas fluorescens à des températures supérieures à 37°C et de ses conséquences sur son potentiel infectieux, à cause de l’hétérogénéité des souches. Sept souches cliniques croissant à 37°C ou plus ont été soumises à une indentification polyphasique : 2 souches ont été attribuées à Pseudomonas mosselii et 4 ont été caractérisées comme étant les biovars I ou II de P.fluorescens. L’index de liaison des souches identifiées P.fluorescens bv. I et P.mosselii sur les cellules gliales a été comparé à celui d’une souche psychrotrophe de référence, P.fluorescens MF37 (bv. V). La souche clinique de P.fluorescens possédait une gamme de potentiel d’adhérence similaire à celle de MF37. Ces résultats, ainsi que ceux obtenus en comparant le potentiel cytotoxique des souches cliniques de P.fluorescens, suggèrent l’existence de différents mécanismes de virulence, résultant, soit, en une forme peu infectieuse, soit en un micro-organisme dont le potentiel cytotoxique se situe dans la même gamme de valeurs que celui de P.mosselii ou même Pseudomonas aeruginosa.

Document Type: Research Article

Publication date: January 1, 2008

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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