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Introduction:Diet is currently perceived to be the most significant factor contributing to health.The notion that diet can considerably promote health and reduce the risk of disease has led to the development of foods that promote health.Probiotic foods containing human-derived Lactobacillus and Bifidobacterium species is fast gaining worldwide popularity.The determination of cell viability in probiotic products and supplements is of economic,technological and clinical significance.The quality of a probiotic product is determined by the level and viability of probiotic cells it contains,