bacteria bifidobacterium, normal flora of human intestine

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