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Does isopathic phenomenon occur in leprosy?

S Lal, S Natarajan, A J Veliath

    Leprosy in India
    |July 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    This study investigated the isopathic phenomenon in leprosy using BCG and lepromin antigens. Findings suggest BCG does not induce the isopathic phenomenon in leprosy patients.

    Area of Science:

    • Immunology
    • Dermatology
    • Infectious Diseases

    Background:

    • The isopathic phenomenon, where a disease state influences the reaction to a related antigen, is debated in leprosy.
    • Understanding immune responses in leprosy is crucial for diagnosis and treatment.

    Purpose of the Study:

    • To investigate the presence of the isopathic phenomenon in leprosy patients using autoclaved BCG and lepromin antigens.
    • To analyze skin reactions at antigen injection sites across different leprosy classifications.

    Main Methods:

    • Twenty-five leprosy patients, classified by Ridley and Jopling criteria, were injected with lepromin and autoclaved BCG.
    • Skin biopsies from injection sites were examined histopathologically for granuloma formation and cellular infiltration.

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    Main Results:

    • Tuberculoid granulomas were observed at both BCG and lepromin injection sites in tuberculoid, borderline tuberculoid, mid-borderline, and indeterminate leprosy.
    • In lepromatous and borderline lepromatous cases, BCG sites showed foam cells with acid-fast bacilli (AFB) and epithelioid cells, while lepromin sites showed only foam cells with AFB.

    Conclusions:

    • The histopathological findings do not support the occurrence of the isopathic phenomenon in leprosy when using BCG as a related antigen.
    • Distinct skin reactions observed suggest differing immune responses to BCG and lepromin across the leprosy spectrum.