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For example, the large intestine is home to hundreds of bacteria that aid in absorption, excretion, and catalysis of undigested foods. There are also bacteria present in the small intestine that support break down of foods passed down from the stomach as well as nutrient absorption.
Introduction: The normal flora of the gastrointestinal tract of humans consists of a vast number of Gram-negative bacilli (rods). Many of these microorganisms belong to the family Enterobacteriaceae and characteristically, these organisms are facultative anaerobes, oxidase-negative, and glucose fermenters.