bacteria bifidobacterium, normal flora of human intestine

bacteria bifidobacterium yoghurt anaerobic anaerobes bacteriology fermentation bacterial bacillus positive yogurt gram nobody biology biological microbiology bacterium microbe grampositive microorganism nonmotile rodshaped microbiological bifidobacteria adolescentis longum infantis bifidum harmful prebiotics lactis human gut natural flora medicine medical treatment overgrowth commensal colonize orogastrointestinal gastrointestinal tract supplements 3d illustration