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"Phoenix phenomenon" in the growth of Clostridium perfringens

S P Shoemaker, M D Pierson

    Applied and Environmental Microbiology
    |December 1, 1976
    PubMed

    Insights

    The Phoenix phenomenon in Clostridium perfringens involves a three-phase growth cycle after heat treatment. This study clarifies that the initial injury and recovery phases are crucial for understanding bacterial resilience.

    Area of Science:

    • Food Microbiology
    • Bacterial Physiology
    • Microbial Stress Response

    Background:

    • The Phoenix phenomenon describes a unique growth pattern in Clostridium perfringens after heat stress.
    • Understanding factors influencing this phenomenon is critical for food safety and predicting bacterial behavior.

    Purpose of the Study:

    • To investigate the effects of various conditions on the Phoenix phenomenon in Clostridium perfringens Hobbs' serological type 9 (HT9).
    • To elucidate the mechanisms underlying the injury and recovery phases of this phenomenon.

    Main Methods:

    • Culturing Clostridium perfringens HT9 in cooked-meat medium at elevated temperatures.
    • Utilizing sporulation-negative mutants and various assay media.
    • Manipulating anaerobic conditions, diluents, and growth inhibitors (nalidixic acid).

    Main Results:

    • The Phoenix phenomenon, characterized by phases I (decrease), II (recovery), and III (increase), was observed.
    • Sporulation, inoculum age, media, anaerobiosis, and diluent influenced the phenomenon.
    • Strict anaerobiosis required higher temperatures (52.3°C) to observe the phenomenon, which was eliminated by combining strict anaerobiosis, prereduced media, and diluent.
    • Nalidixic acid inhibited phase III, confirming phases I and II as an injury-recovery process.

    Conclusions:

    • The Phoenix phenomenon in Clostridium perfringens is significantly influenced by environmental factors like oxygen availability and media composition.
    • Phases I and II represent a bacterial injury and subsequent recovery process, not directly linked to sporulation.
    • Understanding these recovery mechanisms is key to controlling bacterial growth in food processing.

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