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. 2021 Mar 18;11(3):16–36. doi: 10.5500/wjt.v11.i3.16

Table 1.

Distribution of normal gut flora in different parts of intestine

Intestine sections
Function
Normal flora
Stomach Acid production, pepsin, amylase, CFU < 103/mL Lactobacillus; Streptococcus; Helycobacter pylori
Small intestine: duodenum, jejunum Pancreatic enzymes, bicarbonate ions, bile salts, CFU: 103-104/mL Lactobacilli; Enterococci; Streptococci; Actinobacteria
Small intestine: ileum CFU: 103-109/mL Enterococcus; Bacteroidetes; Lactobacillus; Clostridium; Corynebacteria
Large intestine: caecum, colon Mucus and bicarbonate, CFU:1010-1012/mL Bacteroidetes; Clostridium; Eubacterium; Ruminococcus; Streptococcus; Enterococcus; Lactobacillus; Fusobacteria

CFU: Colony forming units.