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Isolation and typing of Bacillus cereus group strains in an egg breaking factory.

Abstract : Bacteria belonging to the Bacillus cereus group are Gram-positive, rod-shaped, and sporeforming micro-organisms widely distributed in nature. They are commonly found in soil, air, dust, water and in many raw and processed foods. Several strains of this group have been implicated in food-borne illness with two pathogenic forms generally benign and spontaneously resolved, but people who are immuno-suppressed could have complications. Bacteria of B. cereus group are also prolific enzyme producers (lipases, proteases) and are recognised as causing spoilage in milk and egg product factories, even in refrigerated foods when psychrotolerant strains are involved. Liquid egg products usually receive only mild heat treatments inefficient on spores. Monitoring and control of bacteria belonging to the B. cereus group are hence of high importance for the egg breaking industry. Here we report on the typing by ERIC-PCR of bacteria belonging to the B. cereus group collected at different steps on a line of liquid egg product manufacturing. The strains exhibiting the same ERIC-PCR profiles were further discriminated by PFGE. Similar ERIC-PCR and PFGE profiles were observed for strains collected at the pasteurizing level and in two finished egg products. We then hypothesized the formation of a thermotolerant B. cereus-containing biofilm in the pasteurizer, giving rise to the contamination of the finished liquid egg products analyzed.
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Submitted on : Friday, September 7, 2012 - 3:54:11 PM
Last modification on : Wednesday, April 6, 2022 - 4:08:11 PM


  • HAL Id : hal-00729751, version 1


Marie-Françoise Cochet, M. Alabdeh, S. Chevalier, Noël Grosset, Michel Gautier, et al.. Isolation and typing of Bacillus cereus group strains in an egg breaking factory.. 2008, non paginé. ⟨hal-00729751⟩



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