See text Fusobacterium is a genus of obligate anaerobic, Gram-negative,[2] non-sporeforming bacteria[3] belonging to Gracilicutes.

[15] Fusobacterium has been classically considered a normal part of the human oral, gastrointestinal, and female genital flora, which is why infections are not commonly seen.

[16] Research of colon cancer has also shown an overrepresentation of Fusobacterium, both in feces of patients[17] and tumor tissue itself.

F. nucleatum can be detected in tissues, genomic DNA, and feces using methods such as (FQ, q, and dd) polymerase chain reaction and fluorescence in situ hybridization.

However, these are limited because tissues can only be tested after surgery and fecal matter can return false positive results.

[9] F. necrophorum has been found as a common pathogen in the diagnostic of peritonsillar abscess and is more prevalent than other bacteria regarding this infection.

It is also the most frequent leading cause associated with Lemierre Syndrome and is not proven to be a normal part of the human oral bacterium population.

However, this requires the family physician to be conscious of the danger as infections such as Lemierre syndrome affects younger populations and especially those of male gender.

[12] A few strains F. prausnitzii, a gut commensal associated with healthy patients, was completely reclassified as Faecalibacterium (Clostridiales:Ruminococcaceae) in 2002.