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Related Experiment Videos

Antibacterial susceptibility testing by the dip-slide technique: a methodological evaluation.

K Dornbusch, C E Nord, B Olsson

    Chemotherapy
    |January 1, 1976
    PubMed
    Summary

    The dip-slide method effectively identifies resistant bacteria in urine, aiding in selecting appropriate antibacterial therapy. This simple test differentiates strains likely to respond to treatment from those unlikely to benefit.

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    Area of Science:

    • Clinical microbiology
    • Infectious disease diagnostics

    Background:

    • Accurate antibacterial susceptibility testing is crucial for effective urinary tract infection (UTI) treatment.
    • Standardized methods like disc diffusion are reliable but can be time-consuming.
    • Point-of-care or simpler methods are needed for rapid clinical decision-making.

    Purpose of the Study:

    • To evaluate the dip-slide method for antibacterial susceptibility testing of urine specimens.
    • To compare the dip-slide method's accuracy against the standardized disc diffusion method.
    • To determine a reliable cut-off for predicting bacterial resistance using the dip-slide method.

    Main Methods:

    • Urine specimens were tested using both the dip-slide method and the standardized disc diffusion method.
    • A 12 mm inhibition zone on the dip-slide was established as a potential threshold for resistance.

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  • Bacterial strains were tested against sulphisadimidine, ampicillin, nitrofurantoin, and nalidixic acid.

    • Main Results:

    • A 12 mm inhibition zone on the dip-slide effectively identified strains resistant to sulphisadimidine, ampicillin, nitrofurantoin, and nalidixic acid.
    • The accuracy of sulphonamide testing was significantly influenced by the culture medium's composition.
    • The dip-slide method demonstrated utility in distinguishing susceptible from resistant bacterial strains.

    Conclusions:

    • The dip-slide method serves as a valuable tool for rapid antibacterial susceptibility testing in urine specimens.
    • It can reliably differentiate bacterial strains likely to respond to therapy from resistant ones.
    • This method offers a practical alternative for guiding antibiotic selection in suspected UTIs.