Gram Positive Cocci Identification

Laboratory testing algorithm for Streptococcus spp, and Staphylococcus aureus, MRSA, S. epidermidis, S. saprophyticus, and S. lugdunensis

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Gram positive Cocci, Clusters

Staphylococci

Gram positive Cocci, Chains

Streptococci

Catalase Test
Positive - - Negative

Staphylococcus - - Streptococcus

Catalase Positive
Coagulase Test - Positive

Staphylococcus aureus

Catalase Positive
Coagulase Test - Positive
MecA gene - Positive

Methicillin-resistant S. aureus (MRSA)

Catalase Positive
Coagulase Test - Negative

Staphylococcus epidermidis

Catalase Positive - Coagulase Negative
Novobiocin Test - Positive

Staphylococcus saprophyticus

Catalasze Positive - Coagulase Negative
Ornithine decarboxylase - Positive

Staphylococcus lugdunensis