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Related Experiment Videos

Anaerobes survive in clinical specimens despite delayed processing.

J G Bartlett, N Sullivan-Sigler, T J Louie

    Journal of Clinical Microbiology
    |February 1, 1976
    PubMed
    Summary

    Most pathogenic anaerobes survive in purulent exudate even after prolonged air exposure, with sampling variations being the primary cause of inconsistent culture results. This study investigated air exposure effects on anaerobic bacteria recovery.

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    Area of Science:

    • Microbiology
    • Clinical Diagnostics

    Background:

    • Anaerobic bacteria are crucial in mixed infections but difficult to culture.
    • Prolonged air exposure can compromise anaerobic organism recovery.

    Purpose of the Study:

    • To assess the impact of extended air exposure on the recovery of anaerobic bacteria from purulent specimens.
    • To identify factors influencing anaerobic bacteria isolation rates in clinical samples.

    Main Methods:

    • Quantitative cultures of 11 purulent specimens from mixed aerobic-anaerobic infections.
    • Specimens were processed immediately and after air exposure (10 min, 1, 4, 24 h).
    • Total anaerobic and aerobic strains were identified and enumerated.

    Main Results:

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  • Most anaerobic strains (22/26) remained recoverable after 24 hours of air exposure.
  • Numerical concentrations of anaerobes showed minimal changes across sampling times.
  • Eleven anaerobic strains were initially undetected but appeared in later cultures, suggesting sampling variability.

    • Conclusions:

    • Pathogenic anaerobes demonstrate significant survival in purulent exudate despite prolonged air exposure.
    • Inconsistent culture results are primarily attributed to sampling inconsistencies rather than organism viability loss due to air exposure.