Fusobacterium

Fusobacterium is a genus of anaerobic, Gram-negative bacteria, similar to Bacteroides. Individual cells are rod-shaped bacilli with pointed ends. Strains of Fusobacterium cause several human diseases, including periodontal diseases, Lemierre's syndrome, and topical skin ulcers.
Although older sources state that Fusobacterium is part of the normal flora of the human oropharynx, the current consensus is that Fusobacterium should always be treated as a pathogen. F. prausnitzii, a gut commensal associated with healthy patients, was moved out of Fusobacterium into its own genus, Faecalibacterium, in 2002.
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