bacteria lactobacillus, normal flora of small intestine

abdomen acid acidophilus anatomical anatomy bacteria bacterium body bowel casei colon crispatus digestion digestive disease enteric flora gasseri gramnegative gut health healthy human ileum illustration inflammation internal intestine jejunum jensenii lactic lactobacillus lactobacterium medical medicine microbiome microflora normal overgrowth pathology probiotic realistic reuteri rhamnosus rod sbt2055 science syndrome yogurt