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R factors in group D streptococci: classification by compatibility

P Messi, M Bondi, V Borghi

    Microbiologica
    |July 1, 1982
    PubMed
    Summary

    Enterococci bacteria commonly exhibit transferable antibiotic resistance via R-factors. Researchers identified this resistance in 57.7% of tested D streptococci strains, characterizing 24 R-factor plasmids, including a novel group V.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Antibiotic resistance in enterococci is a significant public health concern.
    • R-factors are a primary mechanism for the spread of transferable resistance among bacteria.

    Purpose of the Study:

    • To investigate the prevalence of transferable antibiotic resistance in D streptococci.
    • To characterize the plasmids associated with transferable resistance in these strains.

    Main Methods:

    • Tested 106 strains of D streptococci over a two-year period.
    • Determined the presence of transferable resistance.
    • Classified the compatibility groups of 24 R-factor plasmids.

    Main Results:

    • Transferable resistance was detected in 45 strains (57.7% of resistant strains).
    • Plasmids were assigned to compatibility groups: 12 to group I, 4 to group II, 1 to group III, 1 to group IV.
    • Two R-factors were not classifiable into existing groups, suggesting a new compatibility group (V).

    Conclusions:

    • D streptococci harbor significant levels of transferable antibiotic resistance.
    • The characterization of R-factor plasmids provides insights into resistance mechanisms.
    • The identification of a potential new plasmid compatibility group warrants further investigation.

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