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Clostridium botulinum subtype Ba.

D F Giménez

    Zentralblatt Fur Bakteriologie, Mikrobiologie, Und Hygiene. Series A, Medical Microbiology, Infectious Diseases, Virology, Parasitology
    |May 1, 1984
    PubMed
    Summary
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    Clostridium botulinum strain 657 produces a complex toxin. This toxin contains both type B (95%) and type A antigenic fractions, suggesting a new subtype, Ba.

    Area of Science:

    • Microbiology
    • Toxicology
    • Immunology

    Background:

    • Clostridium botulinum is a bacterium known to produce potent neurotoxins.
    • Strain 657 was previously characterized as a potential toxin variant of Clostridium botulinum type B.

    Purpose of the Study:

    • To characterize the antigenic properties of the toxin produced by Clostridium botulinum strain 657.
    • To determine if strain 657 represents a novel serotype or subtype of Clostridium botulinum.

    Main Methods:

    • Neutralization tests using types A and B botulinal antitoxins at various dosage levels (mouse LD50).
    • Serological screening of toxins from isolated colonies to rule out cross-contamination.
    • Testing of strain 657 rabbit antitoxin for neutralizing activities.

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    Main Results:

    • The toxin from strain 657 was found to be a complex mixture, primarily composed of type B (approximately 95%) and also containing type A antigenic fractions.
    • Cross-contamination between serotypes A and B was effectively ruled out through rigorous colony screening.
    • Strain 657 rabbit antitoxin demonstrated neutralizing activities against both type A and type B toxins.

    Conclusions:

    • Clostridium botulinum strain 657 produces a novel complex toxin.
    • The findings support the classification of strain 657 as the prototype for a new Clostridium botulinum serotype, specifically subtype Ba.