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Coagulase is a protein enzyme produced by several microorganisms that enables the conversion of fibrinogen to fibrin. In the laboratory, it is used to distinguish between different types of Staphylococcus isolates. Importantly, S. aureus is generally coagulase-positive, meaning that coagulase negativity usually excludes S. aureus. However it is now known that not all S. aureus are coagulase-positive.
- COAGULASE test which is positive for Staphylococcus aureus (generally accepted criterion for the identification) and negative for all other Staphylococci. Coagulase is an enzyme used by S.aureus to induce coagulation and convert soluble fibrinogen into fibrin which will protect bacteria from the immune system.