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Bacterial pollution of cutting fluids: a risk factor for occupational diseases
S Jaksić1, S Uhitil, J Zivković
1Veterinary Faculty, University of Zagreb, Croatia.
Abstract:
An outbreak of occupational diseases involving 38 metal workers with local infections on the hands and the face (53%), bronchitis (29%), and bronchopneumonia (18%) urged an examination of 150 samples of emulsions which the workers used in processing metals. Among the isolated bacteria, the most frequent was Pseudomonas aeruginosa (48%), followed by Escherichia coli (44%), Proteus spp. (11%), Enterococcus faecalis (9%), Enterobacter aerogenes (7%), Citrobacter spp. (5%), Shigella spp., Staphylococcus aureus (3%), and the sulphite reducing Clostridia (1%). Moulds and yeasts were isolated from all tested samples. Most samples counted about 3 x 10(5)/ml of colony forming units. It was concluded that all emulsions and other substances which come in direct contact with the workers should be regularly monitored. Furthermore, preservatives should be added to prevent microbial infection.
Insights
Metalworking fluid microbial contamination caused occupational diseases in 38 workers. Regular monitoring and preservatives are recommended to prevent Pseudomonas aeruginosa and Escherichia coli infections from these industrial emulsions.
Area of Science:
- Occupational Health
- Microbiology
- Industrial Hygiene
Background:
- An outbreak of occupational diseases, including skin infections, bronchitis, and bronchopneumonia, affected 38 metal workers.
- The diseases were linked to the use of metal processing emulsions.
Purpose of the Study:
- To identify microbial contaminants in metal processing emulsions.
- To determine the association between microbial contamination and occupational diseases in metal workers.
Main Methods:
- 150 samples of metal processing emulsions were collected and analyzed for microbial content.
- Bacterial and fungal presence and concentration (colony forming units/ml) were quantified.
Main Results:
- Pseudomonas aeruginosa (48%) and Escherichia coli (44%) were the most prevalent bacteria isolated.
- Moulds and yeasts were found in all samples, with an average concentration of 3 x 10(5) CFU/ml.
- Isolated microorganisms included Proteus spp., Enterococcus faecalis, Enterobacter aerogenes, Citrobacter spp., Shigella spp., Staphylococcus aureus, and sulphite-reducing Clostridia.
Conclusions:
- Metal processing emulsions are a significant source of microbial contamination.
- Regular monitoring of emulsions and the addition of preservatives are crucial to prevent microbial infections in workers.
- Implementing strict hygiene protocols is essential in metal processing environments.