Intestinal bacteria (flora), which are the 'friendly' bacteria living in the gut, are vital for the proper absorption of nutrients; they also inhibit the growth of the candida albicans yeast (thrush).  The Lactobacillus acidophilus bacteria are abundant in yoghurts and serve to strengthen the intestinal conditions, including intestinal putrefaction (food decaying in the intestines), vaginal yeast infections, constipation and flatulence.

Their main antagonists are antibiotics, which kill all micro-organisms, wheather 'friend' or 'foe'.  Thus, when on plenty of yoghurt and by supplementing with acidophilus capsules. 

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Nutrients A-Z, by Dr. Michael Sharon