probiotics. good bacteria and microorganisms for human health. microscopic probiotics, good bacterial flora

abstract acidophilus antibiotic bacillus background bacteria bacterial bacteriology bacterium bifidobacteria bifidobacterium biological biology biotechnology bulgaricus casei digestion fermentation flora food germ good gut health healthy human icon illustration infection lactic lactobacillus lactococcus medical medicine micro microbe microbiome microbiota microorganism microscopic mrsa organism positive prebiotic probiotic propionibacterium science streptococcus vector yoghurt