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Numerical taxonomy of aquatic Acinetobacter isolates

J E Pagel, P L Seyfried

    Journal of General Microbiology
    |August 1, 1976
    PubMed
    Summary

    This study differentiated aquatic Acinetobacter strains, identifying two main groups. One group, similar to Acinetobacter calcoaceticus, included most clinical isolates, while the other, less biochemically active, comprised mostly aquatic strains.

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    Area of Science:

    • Microbiology
    • Bacteriology
    • Genomics

    Background:

    • Acinetobacter species are Gram-negative bacteria with clinical and environmental relevance.
    • Distinguishing between environmental and clinical isolates is crucial for understanding their roles.

    Purpose of the Study:

    • To classify aquatic Acinetobacter strains based on phenotypic characteristics.
    • To compare aquatic isolates with clinical strains and reference genera.
    • To identify potential new species within the Acinetobacter genus.

    Main Methods:

    • Phenotypic characterization of 270 aquatic Acinetobacter strains and 48 clinical/reference strains.
    • Analysis of 89 morphological, physiological, nutritional, and biochemical features.
    • Computer-assisted analysis using simple matching coefficient and unweighted pair-group clustering.

    Main Results:

    • Two major phenons were identified, separating oxidase-positive, motile, or facultatively anaerobic strains.
    • Phenon 2 aligned with Acinetobacter calcoaceticus, containing most clinical isolates.
    • Phenon 1, primarily aquatic isolates, represented a distinct group with lower biochemical activity.
    • Three subphenons were delimited within each major phenon.
    • Diagnostic criteria for differentiating the phenons were proposed.

    Conclusions:

    • The study successfully differentiated aquatic Acinetobacter isolates into two phenons, suggesting potential for a second species.
    • Phenon 2 represents Acinetobacter calcoaceticus, while Phenon 1 may be a novel, less biochemically active species.
    • The findings provide a basis for improved classification and identification of Acinetobacter species.

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