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Immunochemical study of nutritionally variant streptococci.

I van de Rijn, M George

    Journal of Immunology (Baltimore, Md. : 1950)
    |October 1, 1984
    PubMed
    Summary

    Nutritionally variant streptococci (NVS) are linked to endocarditis and can be classified into three serotypes. Surface protein analysis revealed distinct patterns for each serotype, aiding in their differentiation.

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    Area of Science:

    • Microbiology
    • Bacteriology
    • Immunology

    Background:

    • Nutritionally variant streptococci (NVS) are known for their satellite growth patterns around other bacteria.
    • NVS are frequently isolated from patients diagnosed with subacute bacterial endocarditis.
    • Previous characterization of NVS has been limited, necessitating further investigation into their classification and surface properties.

    Purpose of the Study:

    • To differentiate Nutritionally variant streptococci (NVS) into distinct serotypes.
    • To investigate the surface protein profiles of different NVS serotypes.
    • To explore potential correlations between NVS serotypes, disease, and patient origins.

    Main Methods:

    • Rocket-line electrophoresis and hemagglutination inhibition assays were employed for serotyping.
    • Surface protein analysis was conducted using SDS extraction and radioiodination techniques.
    • Bacterial strains were isolated from patients with subacute bacterial endocarditis.

    Main Results:

    • 103 NVS strains were analyzed, with 99 expressing one or more of the three identified serotype antigens.
    • Serotype I NVS exhibited unique surface proteins, while serotypes II and III shared common surface proteins.
    • SDS extraction yielded more radioiodinatable surface protein from serotypes I and III compared to serotype II.

    Conclusions:

    • NVS can be reliably classified into three serotypes based on antigen expression.
    • Surface protein analysis provides a method for differentiating NVS serotypes.
    • No correlation was found between NVS serotype and patient disease or origin, suggesting serotypes are not directly linked to specific clinical presentations.

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