Table I.

Main endogenous factors determining the composition of the intestinal microbiota (IMB) (1,2,27–30).

1. Mucosal	2. Luminal
Specific	pH, gases
IgA	Secretion of digestive enzymes
Specificity of epithelial receptors	Peristalsis
Non-specific	Antagonism of microbiota
Complement	Lysozyme
Lysozyme
Interferon
Mucin
Dendritic cells/Toll-like receptors
Colonization resistance