Gram Positive Cocci - Bacteria Identification Algorithm

Catalase(+)

 - Coag(+): Staphylococcus aureus

 - Coag(-)

    - Oxidase(+), Bacitracin(S): Micrococcus sp

    - Oxidase(-), Bacitracin(R)

      - Novo(S): Staphylococcus lugdunensis, Staphylococcus epidermidis and CONS

      - Novo(R): Staphylococcus saprophyticus

Catalase(-)

 - Esculin(-)

   - α-Heme

     - Optochin(S): Streptococcus pneumoniae

     - Optochin(R): Viridans Strep.

   - β-Heme

     - Bacitracin(S): Streptococcus pyogenes (GAS)

     - Bacitracin(R): Streptococcus agalactiae (GBS)

 - Esculin(+), α/β/γ Hemolysis

   - 6.5% NaCl(+): Enterococcus sp.

   - 6.5% NaCl(-): Non-Enterococcus Group D Streptococci



by Cullen Lilley, MS, MDxT(AAB) @cullen_lilley



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