Bacteroides fragilis is a Gram-negative bacillus bacterium species, and an obligate anaerobe of the gut.
B. fragilis group is the most commonly isolated bacteriodaceae in anaerobic infections especially those that originate from the gastrointestinal flora. B. fragilis is the most prevalent organism in the B. fragilis group, accounting for 41% to 78% of the isolates of the group. The B. fragilis group is the species of Bacteroidaceae that is isolated with greatest frequency in clinical specimens. These
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