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Passive airborne dust sampling to assess mite antigen exposure in farming environments
Eva Zahradnik1, Ingrid Sander, Benjamin Kendzia
1Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-Universität Bochum (IPA), Buerkle-de-la-Camp-Platz 1, 44789, Bochum, Germany. zahradnik@ipa-dguv.de
Abstract:
The aim of this study was to estimate mite antigen exposure in farming environments by passive sampling of airborne dust. Antigen concentrations were measured with enzyme immunoassays specific for three storage mites (SM): Acarus siro, Lepidoglyphus destructor, Tyrophagus putrescentiae and the house dust mite (HDM) Dermatophagoides pteronyssinus. Dust samples were collected with electrostatic dust fall collectors (EDCs) in three different areas of cattle farms. EDCs were placed in cow stables (working area), in changing rooms (transit area) and in different rooms of farmer dwellings (living area). Mite concentrations in the living area of farm homes were compared to those of urban homes. In dust samples from stables, antigens of all four mite species could be detected. The highest exposure level was to L. destructor (median 56.7 μg/m(2)), the lowest to A. siro (median 14.4 μg/m(2)). Mite concentrations of different species showed no correlation within the cow stables. In comparison to stables, the median mite concentrations in farm homes were significantly lower, ranging from below the detection limit to 1.5 μg/m(2). Antigens of SM were predominantly found in changing rooms and kitchens, and HDM antigens were mainly detected in bedrooms. Antigens of all mites were measured the least often in living rooms. T. putrescentiae was the most prevalent mite in all room types, and the exposure levels correlated strongly between different rooms. The number of SM positive samples in farm homes was considerably higher than in urban homes, while the percentage of HDM positive samples did not differ significantly.
Insights
Farming environments show significant mite antigen exposure, particularly storage mites (SM) in stables and changing rooms. Farm homes had lower mite levels than stables but higher SM presence than urban homes.
Area of Science:
- Environmental Science
- Allergen Exposure
- Occupational Health
Background:
- Farming environments present unique exposures to airborne allergens.
- Storage mites (SM) and house dust mites (HDM) are common indoor allergens.
- Understanding mite distribution in agricultural settings is crucial for public health.
Purpose of the Study:
- To quantify mite antigen exposure in various farm areas using passive dust sampling.
- To compare mite levels in farm homes versus urban homes.
- To identify specific mite species prevalence across different farm zones.
Main Methods:
- Passive dust sampling using electrostatic dust fall collectors (EDCs).
- Enzyme immunoassays to detect antigens of three SM species (Acarus siro, Lepidoglyphus destructor, Tyrophagus putrescentiae) and one HDM species (Dermatophagoides pteronyssinus).
- Sampling conducted in cow stables, changing rooms, and farm dwellings, with comparisons to urban homes.
Main Results:
- All four mite species' antigens detected in cow stables, with Lepidoglyphus destructor showing the highest median exposure.
- Mite concentrations were significantly lower in farm homes compared to stables.
- Storage mites were more prevalent in farm homes than urban homes, while house dust mite prevalence did not differ significantly.
Conclusions:
- Cattle farm environments harbor diverse mite allergens, with varying distribution across occupational and domestic areas.
- While farm homes show reduced overall mite levels compared to stables, they exhibit a higher prevalence of storage mites compared to urban residences.
- Tyrophagus putrescentiae was the most common mite across all sampled areas.
