Food-borne pathogens such as Staphylococcus aureus, Listeria monocytogenes, Salmonella, Escherichia coli and Bacillus cereus are easy to exist in cold dishes, even in hotels, unless they are made by hotels with Michelin height.

Listeria, also known as Listeria, belongs to gram-positive bacteria and facultative anaerobic bacteria, which means that bacteria can grow and reproduce in aerobic or anaerobic environment.