Anaerobic gram negative bacillus
Normal flora of mouth, gastrointestinal tract, female genitourinary tract.
Head and neck infection including Lemierre's syndrome (septic jugular thrombosis) associated with F. necrophorum bacteremia and metastatic abscesses
Diabetic foot infection
Bacteremia with F. necrophorum should prompt thorough investigation for septic thrombophlebitis (Lemierre's syndrome)