Low translocation of Bacillus thuringiensis israelensis to inner organs in mice after pulmonary exposure to commercial biopesticide |
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Authors: | Kenneth Klingenberg Barfod Lasse Smidt Karen A. Krogfelt Lars Andrup |
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Affiliation: | 1. National Research Centre for the Working Environment , Lers? Parkalle 105, DK-2100, Denmark;2. Department of Microbiology and Risk assessment Technical University of Denmark , M?rkh?j Bygade 19, DK-2860, Denmark;3. Department of Bacteriology, Mycology and Parasitology , Statens Serum Institut , Artillerivej 5, DK-2300, Denmark |
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Abstract: | Translocation of viable cells from a Bacillus thuringiensis israelensis-based biopesticide to inner organs in a mouse model was studied. Mice were exposed to the originally formulated product through the lungs and gastrointestinal tract by intratracheal instillation. Colony forming units (CFU) were grown from lungs, caecum, spleen and liver on Bacillus cereus-specific agar (BCSA) after 24 h and finally determined to be biopesticide strain B. t. israelensis by large plasmid profile. No CFU were found in spleen or liver of the control mice or in any aerosol background or material. We have shown that viable cells from the commercial product can translocate to spleen and liver of immunocompetent mice in a dose-dependent manner. Furthermore, we discuss the methods of exposure and how bacterial translocation should be taken into consideration when evaluating the safety of novel or reintroduced biopesticides in the future. |
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Keywords: | Bacillus thuringiensis israelensis biopesticide translocation intratracheal instillation |
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