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Probiotic bacteria have been defined in many ways by different people but perhaps the most widely used and accepted definition is proposed by Fuller (1992) according to which probiotics are living microorganisms which when ingested have beneficial effects on the host by improving the physiological functions of the intestinal microflora. Another definition has been provided by Havenaar and Huis In’t Veld (1992), which explains probiotics as “a preparation of or a product containing viable, defined microorganisms in sufficient numbers, which alter the microbiota (by implantation or colonization) in a compartment of the host and by that exert beneficial health effects in this host.” Probiotics have also been defined as “live microbes which transit the gastro-intestinal tract and in doing so benefit the health of the consumer”(Tannock et al. 2000), which contradicts the earlier definitions focusing only on the interactions between the probiotic organisms and the original intestinal