Bacteroides spp

From Dog
Cellulitis in a dog due to Bacteroides spp[1]

Bacteroides spp are a Gram-negative anaerobic bacteria that are normally associated with purulent infections in dogs.

These bacteria are part of the normal oral and intestinal biotome[2] of dogs, and have been cultured in enterohepatic circulation associated with hepatobiliary disease[3] as well as systemic infections such as prostatitis[4] and meningoencephalitis[5].

Species which are pathogenic in dogs include:

  • Bacteroides vulgatus[6]
  • Bacteroides fragilis[7]
  • Bacteroides splanchnicus[8]
  • Bacteroides forsythus[9]

Greater numbers of this bacteria have been found in dogs with diarrhea, although their ability to initiate gastroenteritis in dogs in unsure[10].

Dermal contamination of dogs with this fecal bacteria may play a part in their establishing secondary purulent infections such as abscesses[11].

These bacteria appear to be sensitive to enrofloxacin, amoxycillin/clavulanate, clindamycin[12], ceftiofur, gentamicin and trimethoprim-sulfamethoxazole.


  1. Vetnext
  2. Garcia-Mazcorro JF et al (2012) Effect of the proton pump inhibitor omeprazole on the gastrointestinal bacterial microbiota of healthy dogs. FEMS Microbiol Ecol 80(3):624-636
  3. Wagner KA et al (2007) Bacterial culture results from liver, gallbladder, or bile in 248 dogs and cats evaluated for hepatobiliary disease: 1998-2003. J Vet Intern Med 21(3):417-424
  4. Sóki J et al (2002) Isolation and characterization of an imipenem-resistant Bacteroides fragilis strain from a prostate abscess in a dog. Vet Microbiol 84(1-2):187-190
  5. Radaelli ST & Platt SR (2002) Bacterial meningoencephalomyelitis in dogs: a retrospective study of 23 cases (1990-1999). J Vet Intern Med 16(2):159-163
  6. Chaban B et al (2012) A molecular enrichment strategy based on cpn60 for detection of epsilon-proteobacteria in the dog fecal microbiome. Microb Ecol 63(2):348-357
  7. Radice M et al (2006) Evaluation of subgingival bacteria in the dog and susceptibility to commonly used antibiotics. J Vet Dent 23(4):219-224
  8. Hardham JM et al (2008) Transfer of Bacteroides splanchnicus to Odoribacter gen. nov. as Odoribacter splanchnicus comb. nov., and description of Odoribacter denticanis sp. nov., isolated from the crevicular spaces of canine periodontitis patients. Int J Syst Evol Microbiol 58(1):103-109
  9. Hudspeth MK et al (1999) Characterization of Bacteroides forsythus strains from cat and dog bite wounds in humans and comparison with monkey and human oral strains. J Clin Microbiol 37(6):2003-2006
  10. Jia J et al (2010) Investigation of the faecal microbiota associated with canine chronic diarrhoea. FEMS Microbiol Ecol 71(2):304-312
  11. Wang AL et al (2009) Orbital abscess bacterial isolates and in vitro antimicrobial susceptibility patterns in dogs and cats. Vet Ophthalmol 12(2):91-96
  12. Jang SS et al (1997) Organisms isolated from dogs and cats with anaerobic infections and susceptibility to selected antimicrobial agents. J Am Vet Med Assoc 210(11):1610-1614