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Regarded as harmless to humans, Bacillus thuringiensis (Bt) is used worldwide as a commercial biopesticide for the pest control of insects. It is typically used in large spray campaigns on open fields or indoor in green houses . The insecticidal effect is largely due to the characteristic ability to produce specific insect toxins from crystal toxin genes mostly harboured on large plasmids . Bt is a Gram positive, Terminal deoxynucleotidyl transferase endospore-forming bacterium closely related to the opportunistic human pathogen Bacillus cereus . Commercial Bt strains have been isolated from human faecal samples and nasal lavage cultures and elevated human IgE antibody levels have been reported after occupational exposure [4–6]. Most epidemiological and occupational studies on biopesticides have focused on immune Cyclosporin A solubility dmso responses, infection, food poisoning or other gastro-intestinal symptoms [4, 7–9]. The possible long-term effects after repeated pulmonary exposure in humans working with Bt biopesticides have not yet been investigated, although the endospore sizes (1-2 μm in diameter) are within inhalable sizes for humans and mice [10, 11].