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[Shigella toxicity in immunological tolerance].

V A Borisov

    Zhurnal Mikrobiologii, Epidemiologii I Immunobiologii
    |November 1, 1987
    PubMed
    Summary

    The toxicity of Shigella sonnei in mice depends on whether the bacteria are live or killed, their ability to enter the bloodstream, and the specific nature of immune tolerance to Shigella antigens.

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    Area of Science:

    • Microbiology
    • Immunology
    • Toxicology

    Background:

    • Shigella sonnei is a pathogen causing bacterial dysentery.
    • Understanding bacterial toxicity is crucial for developing effective treatments.
    • Immunological tolerance can influence host-pathogen interactions.

    Purpose of the Study:

    • To investigate the toxic effects of live and killed Shigella sonnei cultures.
    • To examine toxicity in normal mice and in mice with specific immune tolerance.
    • To determine factors influencing Shigella sonnei toxicity.

    Main Methods:

    • Intraperitoneal administration of live and killed Shigella sonnei cultures.
    • Use of normal mice and mice with induced tolerance to Shigella O-antigen.
    • Assessment of toxicity in relation to bacterial viability and blood penetration.
    • Evaluation of immunological tolerance to Shigella antigens.

    Main Results:

    • Bacterial viability significantly impacts Shigella sonnei toxicity.
    • The capacity of bacteria to penetrate the bloodstream is a key factor in toxicity.
    • The specific nature of immunological tolerance influences the toxic effect.
    • Differences in toxicity were observed between normal and tolerant mice.

    Conclusions:

    • Shigella sonnei toxicity is multifactorial, involving bacterial state, invasiveness, and host immune status.
    • Viability and blood penetration are critical determinants of pathogenic effects.
    • Immune tolerance modulation affects the outcome of Shigella infection and toxicity.

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