Bacterial Taxonomy

MORPHOLOGY Gram ⊕ examples Gram ⊝ examples
Spherical (coccus) Staphylococcus (clusters)

Streptococcus (chains or pairs)

Enterococcus (pairs or short chains)

Moraxella catarrhalis

Neisseria

Rod (bacillus) Bacillus

Clostridium

Corynebacterium

Gardnerella (gram variable)

Lactobacillus

Listeria

Mycobacterium (acid fast)

Cutibacterium (formerly Propionibacterium)

Enterics:

  • Bacteroides
  • Campylobacter
  • E coli
  • Enterobacter
  • Fusobacterium
  • Helicobacter
  • Klebsiella
  • Proteus
  • Pseudomonas
  • Salmonella
  • Serratia
  • Shigella
  • Vibrio
  • Yersinia

Respiratory:

  • Acinetobacter baumannii
  • Bordetella
  • Burkholderia cepacia
  • Haemophilus (pleomorphic)
  • Legionella (silver stain)

Zoonotic:

  • Bartonella
  • Brucella
  • Francisella
  • Pasteurella
Branching filamentous Actinomyces

Nocardia (weakly acid fast)

 
Pleomorphic (no cell wall)   Anaplasma, Ehrlichia

Chlamydiae (Giemsa)

Rickettsiae (Giemsa)

Mycoplasma (contains sterols, which do not Gram stain),

Ureaplasma

Spiral   Spirochetes:

  • Borrelia (Giemsa)
  • Leptospira
  • Treponema

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