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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