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Airborne bacteria and viruses.

C S Cox

    Science Progress
    |January 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    Microbial aerosols spread disease indoors. While environmental stresses like desiccation damage airborne microbes, their repair mechanisms and rehydration capabilities ensure disease transmission via the aerobiological pathway.

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    Area of Science:

    • Aerobiology
    • Microbiology
    • Environmental Health

    Background:

    • Microbial aerosols are generated by common activities and dispersed by air.
    • Inhaled microbes can cause allergic responses or infectious diseases.
    • Microbial viability and infectivity depend on environmental factors and host defenses.

    Purpose of the Study:

    • To investigate the factors influencing microbial viability and infectivity in airborne particles.
    • To understand the mechanisms by which microbes survive and cause disease via the aerobiological route.

    Main Methods:

    • Analysis of microbial responses to environmental stresses such as desiccation, radiation, oxygen, ozone, and pollutants.
    • Examination of phase changes in microbial membranes (phospholipid bilayers) and protein moieties at varying relative humidity (RH).

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  • Assessment of microbial damage, repair mechanisms, and host defense interactions.

    • Main Results:

    • Desiccation is a primary stress for airborne microbes indoors.
    • Gram-negative bacteria and lipid-enveloped viruses undergo membrane phase changes affecting protein cross-linking, particularly at mid to high RH.
    • Lipid-free viruses experience rapid surface protein reactions at low RH.
    • Environmental factors like radiation and pollutants cause chemical, physical, and biological damage to microbial components.
    • Microbial repair mechanisms, especially enzymatic repair under genetic control, can counteract damage.
    • Reversibility of membrane changes through rehydration is crucial for survival.

    Conclusions:

    • The interplay between microbial damage and repair, alongside host defenses, dictates airborne disease transmission.
    • Indoor desiccation is a key stress, but microbial repair and rehydration mechanisms ensure the persistence of pathogens.
    • The aerobiological pathway remains a significant route for infectious disease spread due to microbial adaptability.