Probiotics are live microbial strains that, when applied in adequate doses affects the composition of gastrointestinal tract (GIT) microflora and extends a range of host benefits which so far claimed to be: pathogens interference, immune system stimulation and immunomodulation, antimutagenic activities, alleviation of symptoms of lactose intolerance and reduction of cholesterol. Probiotics selected for commercial use in foods and in therapeutics must retain the characteristics for which they are originally selected. These include characteristics for growth and survival during manufacture and...