intestinal villi with enteric bacteria

digestive system 3d human anatomy illustration digestion body medical anatomical science health intestine small healthy abdomen medicine disease colon gut bowel pathology inner gramnegative enteric rod jejunum ileum bacterium microbiome microflora normal flora inflammation probiotic lactobacillus lactic acid bifidobacteria bifidobacterium diarrhea constipation infection salmonella shigella escherichia coli overgrowth bacterial intestinal