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Related Experiment Videos

Disk susceptibility studies with cefazolin and cephalothin.

P Actor, J Guarini, J Uri

    Antimicrobial Agents and Chemotherapy
    |January 1, 1974
    PubMed
    Summary

    Cefazolin shows better antibiotic activity than cephalothin against clinical isolates. Standard cephalothin disk tests may inaccurately predict cefazolin susceptibility, recommending a specific cefazolin disk or reinterpreted zones.

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    Area of Science:

    • Microbiology
    • Infectious Diseases
    • Clinical Pharmacy

    Background:

    • Disk susceptibility testing is crucial for guiding antibiotic therapy.
    • Cephalothin and cefazolin are commonly used cephalosporin antibiotics.
    • Accurate susceptibility testing ensures effective treatment of bacterial infections.

    Purpose of the Study:

    • To compare the in vitro activity of cefazolin and cephalothin against clinical bacterial isolates.
    • To evaluate the accuracy of standard cephalothin disk diffusion tests in predicting cefazolin susceptibility.
    • To recommend improvements in disk susceptibility testing for cefazolin.

    Main Methods:

    • Minimal inhibitory concentration (MIC) determination for 591 clinical isolates.
    • Disk susceptibility testing using standard Bauer-Kirby method.

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  • Comparison of cefazolin and cephalothin activity based on MIC and disk results.

    • Main Results:

    • Cefazolin exhibited superior in vitro activity compared to cephalothin, indicated by lower MICs.
    • The standard cephalothin disk test failed to accurately identify cefazolin susceptibility in a significant number of Escherichia coli, Enterobacter, and Enterococcus isolates.
    • Cefazolin demonstrated higher inhibition rates in disk susceptibility tests.

    Conclusions:

    • A dedicated cefazolin disk diffusion test with an 18 mm susceptibility breakpoint is recommended.
    • Alternatively, reinterpreting cephalothin disk zone diameters could improve cefazolin susceptibility prediction.
    • Optimizing susceptibility testing methods is vital for effective cefazolin therapy.