Bacillus cereus is a foodborne pathogen and cause a frequent problem due to the biofilms forming in equipment of food production plants. Autoinducer-2 (AI-2) involved in interspecies communication, plays a role in the biofilm formation of B. cereus. In this study, biofilm formation by thirty-nine B. cereus strains isolated from foods produced in Korea was determined. To investigate the effect of AI-2 on biofilm formation by B. cereus SBC27, which had the highest biofilm-forming ability, biofilm densities formed after addition of the AI-2 from Staphylococcus aureus and Escherichia coli were analysed. As a result, it was found that the quorum sensing molecule AI-2 could induce biofilm formation by B. cereus within 24 h, but it may also inhibit biofilm formation when more AI-2 is added after 24 h. Thus, these results improve our understanding of biofilm formation by food-derived B. cereus and provide clues that could help to reduce the impact of biofilms, the biggest problem in food processing environments, which has an impact on public health as well as the economy.

蜡状芽孢杆菌是一种食源性病原体，由于在食品生产厂的设备中形成生物膜，因此经常引起问题。参与种间交流的 Autoinducer-2 (AI-2) 在蜡状芽孢杆菌的生物膜形成中发挥作用。在这项研究中，确定了从韩国生产的食品中分离出的39 株蜡状芽胞杆菌菌株的生物膜形成。为了研究 AI-2 对具有最高生物膜形成能力的蜡状芽孢杆菌SBC27 生物膜形成的影响，添加来自金黄色葡萄球菌和大肠杆菌的 AI-2 后形成的生物膜密度进行了分析。结果发现，群体感应分子 AI-2 可以在 24 小时内诱导蜡状芽孢杆菌形成生物膜，但如果在 24 小时后添加更多的 AI-2，它也可能抑制生物膜的形成。因此，这些结果提高了我们对食物来源的蜡状芽孢杆菌形成生物膜的理解，并提供了有助于减少生物膜影响的线索，这是食品加工环境中最大的问题，对公众健康和经济都有影响.