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Related Experiment Videos

Phage typing of Staphylococcus epidermidis.

H W Talbot, J T Parisi

    Journal of Clinical Microbiology
    |May 1, 1976
    PubMed
    Summary

    This study evaluated Staphylococcus epidermidis phages for typing clinical isolates. While initial typability was limited, optimized methods improved results, showing reproducible phage typing patterns for S. epidermidis.

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    Area of Science:

    • Microbiology
    • Bacteriology
    • Virology

    Background:

    • Staphylococcus epidermidis is a common cause of nosocomial infections.
    • Effective phage typing is crucial for epidemiological surveillance of S. epidermidis.

    Purpose of the Study:

    • To isolate and characterize novel bacteriophages for typing clinical isolates of Staphylococcus epidermidis.
    • To assess the efficacy of newly isolated phages compared to existing phage sets.
    • To optimize phage typing conditions for improved S. epidermidis typability.

    Main Methods:

    • Isolation of 13 bacteriophages from lysogenic Staphylococcus epidermidis cultures.
    • Phage typing of 223 clinical S. epidermidis isolates using isolated phages and a set from The Netherlands.
    • Evaluation of typing efficiency, lytic reaction clarity, and reproducibility.
    • Optimization of typing conditions including incubation at 45°C and heat shock at 55°C.

    Main Results:

    • No correlation found between phage type, biotype, or clinical source.
    • Typability rates were 35.0% with local phages and 21.5% with Dutch phages at 100x routine test dilution.
    • Typability increased to 43.3% (local) and 24.1% (Dutch) for biotype 1 isolates.
    • Local phages yielded stronger, clearer, and shorter lytic patterns.
    • Incubation at 45°C and heat shock (55°C) increased typability by 12.0% and 20%, respectively.
    • Phage typing patterns demonstrated reproducibility over successive days.

    Conclusions:

    • Newly isolated phages show potential for S. epidermidis typing, offering improved clarity and reproducibility.
    • Optimized pre-typing conditions significantly enhance the typability of S. epidermidis isolates.
    • Further development of a standardized phage typing set is necessary for robust epidemiological studies of S. epidermidis infections.

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