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Airborne microorganisms associated with grain handling

J R Swan1, B Crook

  • 1Microbiology Section, Health and Safety Laboratory, Broad Lane, Sheffield, South Yorkshire, S3 7HQ England, UK. jillian.swan@hsl.gov.uk

Annals of Agricultural and Environmental Medicine : AAEM
|December 16, 1998
PubMed
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Workers exposed to grain dust face high levels of airborne bacteria and fungi, potentially causing allergic respiratory symptoms. This study quantified microbial contamination in farm and dockside grain handling environments.

Area of Science:

  • Occupational Health
  • Environmental Microbiology
  • Allergology

Background:

  • Workers handling grain frequently develop allergic respiratory symptoms.
  • Microbiological contaminants in grain dust are suspected significant contributing factors.
  • Understanding microbial exposure is crucial for mitigating health risks in agricultural and dockside settings.

Purpose of the Study:

  • To examine worker exposure to microorganisms in UK grain dust.
  • To quantitatively and qualitatively analyze airborne grain dust microbiology.
  • To identify predominant microorganisms and their sources.

Main Methods:

  • Aerobiological studies were conducted during farm and dockside grain handling.
  • Airborne grain dust samples were collected for microbiological analysis.

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  • Viable bacteria, fungi, and actinomycetes were cultured, isolated, and identified.

    • Main Results:

    • Workers were frequently exposed to over 1 million bacteria and fungi per cubic meter of air.
    • Airborne bacteria and fungi consistently exceeded 10,000 per cubic meter in all sampled areas.
    • Microorganism types varied between freshly harvested and stored grain but not between grain types.

    Conclusions:

    • Grain handling environments present significant microbial exposure risks to workers.
    • High concentrations of airborne bacteria and fungi are prevalent in both farm and dockside settings.
    • The type of grain is less influential on microbial composition than its harvest or storage status.