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Variable sugar fermentation by clostridia

S Nakashio, S Nakamura, S Nishida

    Microbiology and Immunology
    |January 1, 1982
    PubMed
    Summary
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    Investigating ambiguous sugar fermentation in pathogenic clostridia, this study introduces the pH difference (delta pH) method. This approach clarifies 86% of uncertain reactions, improving bacterial identification.

    Area of Science:

    • Microbiology
    • Bacteriology

    Background:

    • Ambiguous sugar fermentation reactions in pathogenic clostridia pose identification challenges.
    • Previous classifications relied on inconsistent cultural variations.

    Purpose of the Study:

    • To reinvestigate 42 ambiguous ("d") sugar fermentation characteristics of pathogenic clostridia.
    • To establish reliable criteria for clostridial identification using fermentation patterns.

    Main Methods:

    • Reinvestigation of 42 "d" reactions using eight peptone media and 205 clostridial strains.
    • Application of the pH difference (delta pH) method with a critical level of 0.5 pH unit difference.

    Main Results:

    • The delta pH method resolved 36 (86%) of the 42 "d" sugar reactions into positive or negative.

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  • Six sugar reactions remained ambiguous due to extremely weak fermentation.

    • Conclusions:

    • The delta pH method effectively clarifies ambiguous fermentation reactions in pathogenic clostridia.
    • This method offers distinct criteria for bacterial identification, minimizing incorrect evaluations.