probiotics, lactic acid bacteria. bacteria and microorganisms. microscopic probiotics, bacterial flora

acid acidophile acidophilus bacillus bacteria bacterial bacteriology bacterium bifidobacteria bifidobacterium biological biotechnology blue bulgaricus colony digestion fermentation flora gram gram-positive health healthy human lactic lactobacilli lactobacillus medical medicine microbe microbiological microbiology microbiome microbiota microorganism microscopic molecule nutrition organism positive prebiotic probiotic probiotics producing rod-shaped science stomach therapeutic yoghurt yogurt