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The basic phage set for typing bovine staphylococci.

P J Carroll, P G Francis

    The Journal of Hygiene
    |December 1, 1985
    PubMed
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    Phage typing of bovine Staphylococcus aureus shows reduced effectiveness. While most strains remain typable, the International basic set of phages demonstrates decreased lysogenicity compared to 1972 recommendations.

    Area of Science:

    • Veterinary Microbiology
    • Bacteriology
    • Epidemiology

    Background:

    • Staphylococcus aureus is a significant pathogen in bovine mastitis.
    • Phage typing is a crucial tool for epidemiological surveillance of bacterial strains.
    • The International basic set of phages was established for typing Staphylococcus aureus.

    Purpose of the Study:

    • To assess the current typability of Staphylococcus aureus isolates from bovine milk using the International basic set of phages.
    • To compare current phage typing results with historical data from 1972.
    • To evaluate the lysogenicity of the phage set over time.

    Main Methods:

    • Isolation and identification of Staphylococcus aureus from bovine milk samples.
    • Phage typing of 269 Staphylococcus aureus isolates using the International basic set of 16 phages.

    Related Experiment Videos

  • Standardized methodology at Routine Test Dilution.

    • Main Results:

    • 73.6% of the 269 Staphylococcus aureus cultures were typable with the current phage set.
    • This represents a decrease in typability compared to 84-89% reported in 1972.
    • A reduction in the lysogenicity of most phages within the set was observed.

    Conclusions:

    • The International basic set of phages remains capable of typing the majority of bovine Staphylococcus aureus.
    • A decline in phage typing efficiency suggests potential changes in circulating strains or phage efficacy.
    • Further investigation into the reduced lysogenicity is warranted for maintaining effective epidemiological surveillance.