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Reproducibility of biotypes using enterotubes.

J P Kilbourn, J Nyiendo

    The American Journal of Medical Technology
    |May 1, 1979
    PubMed
    Summary
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    The Enterotube system showed low reproducibility for bacterial identification. Most stock strains and clinical urine cultures had variable biotype results, impacting diagnostic accuracy.

    Area of Science:

    • Clinical Microbiology
    • Bacterial Identification Systems

    Background:

    • Accurate bacterial identification is crucial for effective patient treatment.
    • The Enterotube system is a common method for rapid biochemical profiling of Enterobacteriaceae.

    Purpose of the Study:

    • To evaluate the reproducibility of the Enterotube system for bacterial biotype identification.
    • To assess the reliability of Enterotube results in both stock strains and clinical samples.

    Main Methods:

    • Tested 50 stock strains of Enterobacteriaceae across 22 days (interrun) and 10 replicates from one subculture (intrarun).
    • Performed 20 replicate Enterotube tests on 114 clinical urine cultures with high bacterial counts.

    Main Results:

    • Only 4% of stock strains showed interrun reproducibility; 42% showed intrarun reproducibility.

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  • 34% of urine cultures had consistent results across 20 replicates.
  • 44% of urine cultures showed one variant biochemical test result, and 22% showed two or more variations.

    • Conclusions:

    • The Enterotube system demonstrates significant variability in biotype identification, questioning its reliability for clinical diagnostics.
    • Interrun and intrarun reproducibility issues, along with variations in clinical samples, highlight potential limitations of the Enterotube system.