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Method for phage typing group A type 49 streptococci

S A Skjold, L W Wannamaker

    Journal of Clinical Microbiology
    |September 1, 1976
    PubMed
    Summary
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    A new phage subtyping method distinguishes five subtypes of group A type 49 streptococci. This technique aids in tracking bacterial strains from different locations and time periods.

    Area of Science:

    • Microbiology
    • Bacteriology
    • Molecular Biology

    Background:

    • Group A type 49 streptococci are significant pathogens.
    • Accurate subtyping is crucial for epidemiological studies.
    • Existing phage typing methods require adaptation for certain bacterial groups.

    Purpose of the Study:

    • To develop and validate a phage subtyping method for group A type 49 streptococci.
    • To assess the utility of this method for epidemiological surveillance.
    • To differentiate between strains from various geographical origins and time points.

    Main Methods:

    • Utilized lysates from mitomycin C induction of specific type 49 strains as typing agents.
    • Applied the method to 72 type 49 streptococcal strains from 10 global sources.

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  • Analyzed lytic patterns to distinguish between subtypes.

    • Main Results:

    • Successfully differentiated five distinct phage subtypes (I-V) among the tested strains.
    • Classified 94% of strains into one of the five subtypes.
    • Demonstrated homogeneity within strains from single sources.
    • Showed utility in discriminating strains from different geographical locations and years.

    Conclusions:

    • The described phage subtyping method is effective for group A type 49 streptococci.
    • The method provides valuable epidemiological insights by differentiating strains.
    • Further studies are warranted to explore its application for other clinically relevant bacterial types, including those associated with nephritis.