Sensitization to airborne molds and its health effects in peat moss processing plant workers

Area of Science:

• Occupational Health
• Environmental Medicine
• Mycology

Background:

• Peat moss processing involves exposure to airborne molds, posing potential respiratory risks to workers.
• Sensitization to molds in occupational settings can lead to adverse health outcomes.
• Understanding mold sensitization in peat workers is crucial for implementing effective workplace safety measures.

Purpose of the Study:

• To determine the incidence of sensitization to common molds in peat dust among exposed workers.
• To investigate the association between mold sensitization and respiratory health impacts in these workers.
• To explore the relationship between airborne mold levels, exposure duration, and sensitization rates.

Main Methods:

• Recruited 189 workers from 14 peat moss processing plants and 43 non-exposed controls.
• Collected air samples to quantify airborne molds, bacteria, and dust.
• Administered questionnaires, spirometry, skin-prick tests, and collected blood samples for serological analysis.

Main Results:

• Twenty-eight percent of workers exhibited positive serum reactions to at least one mold.
• Sensitization rates varied significantly between plants and were not correlated with airborne mold levels.
• Workers with positive mold antibodies showed lower forced expiratory volume (FEV) compared to seronegative workers.
• All-year plant workers had higher IgG positive frequencies and lower FEV/FVC ratios than seasonal plant workers.
• Seasonal plants had higher mold contamination, suggesting longer exposure duration increases sensitization.

Conclusions:

• High incidence of mold sensitization observed in peat moss factory workers.
• Mold sensitization is linked to negative respiratory health impacts, including reduced lung function.
• Exposure duration appears to be a more significant factor in sensitization than exposure levels.