Bacillus thuringiensis in fecal samples from greenhouse workers after exposure to B. thuringiensis-based pesticides |
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Authors: | Jensen Gert B Larsen Preben Jacobsen Bodil L Madsen Bodil Smidt Lasse Andrup Lars |
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Institution: | Department of Chemical Working Environments, National Institute of Occupational Health, DK-2100 Copenhagen, Denmark. gbj@ami.dk |
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Abstract: | In a study of occupational exposure to Bacillus thuringiensis, 20 exposed greenhouse workers were examined for Bacillus cereus-like bacteria in fecal samples and on biomonitoring filters. Bacteria with the following characteristics were isolated from eight individuals: intracellular crystalline inclusions characteristic of B. thuringiensis, genes for and production of B. cereus enterotoxins, and positivity for cry11 as determined by PCR. DNA fingerprints of the fecal isolates were identical to those of strains isolated from the commercial products used. Work processes (i.e., spraying) correlated with the presence of B. thuringiensis in the fecal samples (10(2) to 10(3) CFU/g of feces). However, no gastrointestinal symptoms correlated with the presence of B. thuringiensis in the fecal samples. |
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