Gram Positive Cocci Identification

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

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