Abstract
Abstract Exposure to microorganisms, including thermophilic actinomycetes and fungal spores, and to airborne dust produced during compost production and mushroom picking may cause work-related respiratory symptoms. Previous studies have implicated Thermoactinomyces vulgaris and Faenia rectivirgula, the aetiological agents in farmer's lung disease, as causes of these symptoms but these species have been rare in aerobiological studies of mushroom farms. As part of a study of the respiratory health of the exposed workers, we carried out an aerobiological survey of all the stages of commercial mushroom production. Samples of viable airborne microorganisms were collected at a farm from eight locations on two occasions using Andersen cascade impactors. Large numbers of airborne thermophilic actinomycetes, yielding > 106 colony-forming units (cfu) m−3 air sampled, were associated with compost handling. These were predominantly Thermomonospora spp., while Thermoactinomyces spp. and Faenia rectivirgula were few. B...
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