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Enteric bacteria are Gram-negative rods with facultative anaerobic metabolism that live in the intestinal tracts of animals in health and disease. This group consists of Escherichia coli and its relatives, the members of the family Enterobacteriaceae. Enteric bacteria are related phenotypically to several other genera of bacteria such as Pseudomonas and Vibrios. Generally, a distinction can be made on the ability to ferment glucose; enteric bacteria all ferment glucose to acid end products while similar Gram-negative bacteria (e.g. pseudomonads) cannot ferment glucose. Because they are consistent members of the normal flora humans, and because of their medical importance, an extremely large number of enteric bacteria have been isolated and characterized.
Todar's Online Textbook of Bacteriology www.textbookofbacteriology.net.
http://textbookofbacteriology.net/medical.html
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