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Table 1 The content and composition of microflora in different parts of the human digestive tract in health

From: Pathophysiological role of host microbiota in the development of obesity

Habitats of the digestive tract The number of microorganism cells per 1 g of content Dominant microflora
Lumen microflora Surface microflora
Mouth 108–109 1011–1012 Streptococcus (60–90 %), Lactobacillus, Bifidobacterium, Propionibacterium, Bacteroides, Actinomyces
Stomach 102–103 105–106 Acid resistant Lactobacillus, Streptococcus, Staphylococcus
Proximal small intestine 103–105 1010–1011 Streptococcus, Lactobacillus, Enterococcus, Bifidobacterium, Escherichia,
Distal small intestine 108–1010 1010–1012 Lactobacillus, Escherichia, Enterococcus, Bacteroides, Bifidobacterium
Colon 1011–1012 1010–1012 Bifidobacterium, Lactobacillus, Propionibacterium, Bacteroides – 9095 %, Escherichia, Enterococcus – 510 %