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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 – 90–95 %, Escherichia, Enterococcus – 5–10 %