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A functional relationship between delayed hypersensitivity and antibacterial immunity.

T T MacDonald, P B Carter

    Immunological Communications
    |January 1, 1981
    PubMed
    Summary
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    Delayed hypersensitivity reactions enhance antibacterial resistance. Injecting Listeria monocytogenes into these sites inactivated the bacteria, unlike in normal tissue, showing a correlation between reaction severity and resistance.

    Area of Science:

    • Immunology
    • Microbiology
    • Infectious Diseases

    Background:

    • Delayed hypersensitivity is a cell-mediated immune response.
    • The role of localized immune reactions in controlling bacterial infections is not fully understood.

    Purpose of the Study:

    • To investigate the effect of delayed hypersensitivity reactions on the viability of Listeria monocytogenes.
    • To determine if the magnitude of the hypersensitivity response correlates with antibacterial resistance.

    Main Methods:

    • Living Listeria monocytogenes were injected into the footpads of mice.
    • Injections were administered to sites with established delayed hypersensitivity reactions and to normal footpads.
    • Bacterial inactivation was assessed, and its correlation with the hypersensitivity reaction magnitude was analyzed.

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    Main Results:

    • Listeria monocytogenes were inactivated when injected into sites of delayed hypersensitivity.
    • No inactivation was observed when the bacteria were injected into normal footpads.
    • A positive correlation was found between the strength of the delayed hypersensitivity reaction and the level of antibacterial resistance at the injection site.

    Conclusions:

    • Delayed hypersensitivity reactions create an environment that confers resistance to Listeria monocytogenes.
    • The intensity of the localized immune response directly influences the ability to resist bacterial proliferation.