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Appl. Environ. Microbiol., Jan 1995, 389-392, Vol 61, No. 1
Copyright © 1995, American Society for Microbiology

PCR and gene probe identification of botulinum neurotoxin A-, B-, E-, F- , and G-producing Clostridium spp. and evaluation in food samples

P Fach, M Gibert, R Griffais, JP Guillou and MR Popoff
Centre National d'Etudes Veterinaires et Alimentaires, Laboratoire Central d'Hygiene Alimentaire, Paris, France.

A degenerate primer pair was selected to amplify specifically a 260-bp DNA fragment from Clostridium botulinum types A, B, E, F, and G, and five individual probes allowed identification of each toxinotype by hybridization of the PCR products. The 72 strains of different Clostridium species tested and 11 other bacterial species commonly found in food samples gave an amplification product. This assay was able to detect 1 C. botulinum type A or B and 10 C. botulinum type E strains per reaction. With 184 artificially contaminated food samples, after an 18-h enrichment step, the sensitivity was 10 bacteria per g of sample and the correlation with the mouse bioassay reached 95.6%.


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