Reference Tables

Bacterial Organisms by Morphology/Oxygen Requirement [Farm Animal]

Aerobes/Facultatives Anaerobes
Gram-Positive Cocci

  • Dematophilus congolensis (“railroad tracks”)
  • Staphylococcus spp.
  • Streptococcus spp.


  • Trueperella pyogenes


  • Bacillus anthracis (regulatory disease)
  • Corynebacterium spp. (curved rods)
  • Erysipelothrix rhusiopathia
  • Listeria monocytogenes

Filamentous, branching rods

  • Actinomyces spp.
  • Nocardia spp.

  • Actinomyces bovis
  • Clostridium spp. (incl. botulinum, tetani, difficile, and perfringens)
Gram-Negative Bacilli (enteric spp.)

  • Campylobacter spp. (curved rod)
  • Escherichia coli
  • Lawsonia intracellularis
  • Salmonella spp.

Bacilli (non-enteric spp.)

  • Actinobacillus spp.
  • Bordetella spp.
  • Haemophilus spp.
  • Histophilus spp.
  • Mannheimia spp.
  • Pasteurella spp.
  • Proteus spp.
  • Pseudomonas spp.


  • Brucella spp.
  • Moraxella spp.

  • Dichelobacter nodosus
  • Bacteroides spp.
  • Fusobacterium necrophorum
  • Lack a Cell Wall: Mycoplasma spp.
  • Spirochetes: Leptospira spp. (G-), Brachyspira spp. (G-)
  • Acid fastMycobacterium spp.


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