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Updated: Jun 5, 2026

Bioassay-Guided Identification of Natural Products for Biocontrol by Thin Layer Chromatography-Direct Bioautography
Published on: July 26, 2024
Occupational exposure to microorganisms used as biocontrol agents in plant production
1The National Research Centre for the Working Environment, Lersoe Parkalle 105, 2100 Copenhagen OE, Denmark. amm@nrcwe.dk
Abstract:
Exposure to bioaerosols containing fungi and bacteria may cause various deleterious respiratory health effects. Fungi and bacteria are commercially produced and applied to the environment as microbiological pest control agents (MPCAs). Attention has been drawn towards the exposure and health risks due to the use of commercially important MPCAs. As part of a risk evaluation this paper intends to review whether the exposure to MPCAs (Beauveria bassiana, Verticillium lecanii, Trichoderma harzianum, T. viride, T. polysporum, Paecilomyces fumosoroseus, P. lilacinus, Streptomyces griseoviridis, Bacillus subtilis and Ba. thuringiensis) exceeds background exposure levels. The paper is further aimed to focus on the aerosolization of MPCAs in relation to exposure and human inhalation. From the few studies about exposures it is concluded that both people handling MPCAs in occupational settings and residents of an area where MPCAs have been applied may be exposed to MPCAs. The highest exposures to MPCAs are found for people applying MPCAs. In 2 of 12 environments exposure to applied MPCAs were higher than exposure to the total number of bacteria or fungi.
Insights
Exposure to microbiological pest control agents (MPCAs) can pose health risks. This review assesses whether occupational or residential exposure to MPCAs exceeds background levels, focusing on aerosolization and inhalation risks.
Area of Science:
- Environmental microbiology
- Occupational health
- Risk assessment
Background:
- Bioaerosols from fungi and bacteria can cause respiratory issues.
- Microbiological pest control agents (MPCAs) are commercially produced and applied in the environment.
- Concerns exist regarding exposure and health risks associated with MPCA use.
Purpose of the Study:
- To evaluate if MPCA exposure exceeds background levels.
- To assess aerosolization of MPCAs in relation to human inhalation.
- To review existing exposure data for various MPCAs.
Main Methods:
- Literature review of studies on MPCA exposure.
- Analysis of aerosolization data for MPCAs.
- Comparison of MPCA exposure levels with background bioaerosol concentrations.
Main Results:
- Exposure to MPCAs occurs in occupational settings and residential areas post-application.
- Highest MPCA exposures are observed in individuals applying the agents.
- In some environments, applied MPCAs were found at higher concentrations than total background fungi and bacteria.
Conclusions:
- MPCA application leads to human exposure.
- Occupational handling presents the highest exposure risk.
- Further research is needed to fully understand inhalation risks from MPCA aerosolization.
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