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Table 1 Microbiologic Ecology of the Normal Human Intestinal Tract

From: Current insights in to the pathophysiology of Irritable Bowel Syndrome

Oral cavity

Staphylococcus epidermidis

Streptococcus mitis

Streptococcus salivarius

Streptococcus mutans

Lactobacillus spp.

Stomach

Helicobacter pylori

Lactobacillus spp.

Small bowel

Bacteroides fragilis

Prevotella disiens

Prevotella divia

Enterococcus spp

Lactobacillus spp.

Colon

Bacteroides fragilis

Enterococcus faecalis

Bifidobacterium spp

Peptostreptococcus spp

Lactobacillus spp.

Clostridium spp.

Escherichia coli