 Probiotics are live microorganisms or viable spores which support the development of a beneficial gut microflora.Probiotic bacteria (e.g.from the genera "Lactobacillus", "Bifidobacterium", "Enterococcus") counteract undesired microorganisms such as "Salmonella" or "E. coli" by blocking receptors on the gut wall, production of antimicrobial substances or activation of the immune system.