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Related Experiment Videos

Changes in cutaneous flora after wet occlusion.

D J Bibel, J R LeBrun

    Canadian Journal of Microbiology
    |April 1, 1975
    PubMed
    Summary

    Wet occlusion significantly increased forearm aerobic flora in volunteers. Bacterial counts decreased after dressing removal, with individual skin flora compositions remaining unique during recovery. This study highlights microbial dynamics on skin.

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    Area of Science:

    • Microbiology
    • Dermatology
    • Bacterial Ecology

    Background:

    • Understanding the dynamics of aerobic flora on human skin is crucial for dermatology and infection control.
    • Wet occlusion is a common condition that can alter the skin's microbial environment.

    Purpose of the Study:

    • To investigate the changes in aerobic bacterial flora on human forearms under conditions of wet occlusion.
    • To characterize the types and abundance of bacteria present during and after the occlusion period.

    Main Methods:

    • Sampling of aerobic flora from volunteer forearms before, during, and after an 8-day wet occlusion period.
    • Identification of bacterial colonies using replica-plating techniques and standard microbiological methods.
    • Quantification of bacterial counts in colony-forming units per square centimeter (CFU/cm2).

    Main Results:

    • Wet occlusion increased skin flora to over 10^4 CFU/cm2, with counts rapidly decreasing by approximately 10^2 units after dressing removal.
    • While bacterial types were similar across subjects, individual flora composition during recovery was unique.
    • Enterobacteriaceae, particularly Enterobacter aerogenes, colonized half the subjects. Staphylococcus subgroups III and IV were prevalent alongside subgroup II. Most cutaneous diphtheroids were lipophilic and lipolytic.

    Conclusions:

    • Wet occlusion significantly impacts skin aerobic flora, leading to increased bacterial counts.
    • The skin's microbial environment exhibits individual-specific recovery patterns post-occlusion.
    • Specific bacterial groups like Enterobacteriaceae and Staphylococcus subgroups show varying colonization success on human skin.

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