The most numerically dominant bacteria within the human large intestine and most important anaerobic bacteria associated with human infections are species of the genus

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Bacteroides species are the most numerically dominant bacteria within the human large intestine and are also important anaerobic bacteria associated with human infections. Escherichia species are important facultative anaerobic bacteria and can cause intestinal and urinary tract infections. Clostridium species are also important anaerobic bacteria, but they are not as dominant in the human large intestine as Bacteroides species. Flavobacterium species are aerobic bacteria and are not commonly associated with human infections.

The Most Numerically Dominant Bacteria Within the Human Large Intestine