The human jejunum has an endogenous microbiota that differs from those in the oral cavity and colon

Abstract excerpt

The upper half of the human small intestine, known as the jejunum, is the primary site for absorption of nutrient-derived carbohydrates, amino acids, small peptides, and vitamins. In contrast to the colon, which contains 10 11 –10 12 colony forming units of bacteria per ml (CFU/ml), the normal jejunum generally ranges from 10 3 to 10 5 CFU per ml. Because invasive procedures are required to access the jejunum,...

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