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Quantitative relationship between airborne viable and total particles.

G S Oxborrow, N D Fields, J R Puleo

    Health Laboratory Science
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

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    Monitoring airborne microbial contamination is challenging. This study found viable particles are rare, but a correlation exists for particles >5.4 micron in highly controlled environments.

    Area of Science:

    • Environmental microbiology
    • Particle science

    Background:

    • Airborne microbial contamination is a critical concern in controlled environments like laboratories and cleanrooms.
    • Accurate monitoring of microbial contamination is essential for maintaining environmental integrity and product safety.

    Purpose of the Study:

    • To investigate the relationship between total and viable airborne particles in a microbiological laboratory and a Class 100,000 cleanroom.
    • To determine if total particle counts can predict viable particle levels for effective contamination monitoring.

    Main Methods:

    • Utilized six-stage Andersen samplers for enumerating viable particles.
    • Employed a modified Royco particle counter for enumerating total particles.
    • Analyzed particle size distribution and viability in both a standard lab and a cleanroom environment.

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    Main Results:

    • Over 99% of total particles were smaller than 1 micron, with very low viability (<0.01%).
    • Particles larger than 5.4 micron constituted <0.1% of total particles, with 4.5% viability.
    • No correlation between total and viable particles was found when analyzing data from each area individually.
    • A positive correlation was observed when combining data and focusing on particles >5.4 micron.

    Conclusions:

    • Viable particles represent a very small fraction of total airborne particles, making direct correlation difficult.
    • Estimating viable particulates from total particle counts may be feasible only in highly controlled environments, specifically for larger particles (>5.4 micron).
    • Further research is needed to refine predictive models for airborne microbial contamination monitoring.