Discussion
Which of the following genera is included in the family Bacteroi-daceae?
Answer: D
Correct answer: All of these
The family Bacteroidaceae as classically defined embraces the non-sporing, anaerobic, Gram-negative bacilli, and Bacteroides, Fusobacterium and Leptotrichia are all members. Bacteroides species are pleomorphic rods of the gut, Fusobacterium are spindle-shaped organisms of the mouth, and Leptotrichia buccalis is a large filamentous rod of dental plaque. Modern taxonomy has since redistributed several of these genera into separate families, but they remain grouped together clinically as the non-sporing Gram-negative anaerobes.
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