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Serum bactericidal testing with the Autobac system.

S J Sanders, T L Gavan, J B Senturia

    Journal of Clinical Microbiology
    |September 1, 1986
    PubMed
    Summary
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    This study introduces a faster serum bactericidal test using the Autobac system, reducing turnaround time from 48 hours to as little as 3-4 hours for inhibitory titers and 24 hours for bactericidal titers.

    Area of Science:

    • Clinical Microbiology
    • Immunology
    • Pharmacology

    Background:

    • The standard serum bactericidal test (SBT) is crucial for assessing antibiotic efficacy but requires a minimum of 48 hours.
    • This lengthy duration limits its utility in timely clinical decision-making.

    Purpose of the Study:

    • To develop and validate a rapid serum bactericidal test procedure utilizing the Autobac system.
    • To compare the Autobac-based SBT with the conventional tube dilution method.

    Main Methods:

    • The Autobac system was employed to perform serum bactericidal tests.
    • Results were compared against a standardized tube dilution procedure using various bacterial strains, clinical isolates, and patient serum samples.
    • Low-thymidine eugonic broth was used as the diluent in the Autobac system.

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    Main Results:

    • The Autobac system demonstrated high correlation with the tube dilution method (99.2% for bactericidal endpoints).
    • Serum inhibitory titers were obtainable in 3-4 hours (93.4% correlation).
    • Serum bactericidal titers were achieved in 24 hours (95.6% correlation) and in 3-4 hours for most cases (88.4% correlation), excluding staphylococci against penicillin.

    Conclusions:

    • The Autobac system offers a rapid and reliable alternative for performing serum bactericidal tests in clinical laboratories.
    • This accelerated method can significantly reduce the time required for reporting critical antibiotic susceptibility data.