Due to its lack of the coagulase enzyme, S. epidermidis is a member of the CoNS subgroup of staphylococci, which is distinguished from coagulase-positive staphylococci like S. aureus. With 74 identified sequence types (STs), the species exhibits a high level of diversity.
Gram-positive, non-motile cocci arranged in clusters that resemble grapes make up the extremely resilient microorganism S. epidermidis. After being incubated for a night, it grows on blood agar in white, raised, cohesive colonies that are 1-2 mm in diameter and are not hemolytic.
The most accurate way to recognise Staphylococcus aureus is through coagulase testing. Slide coagulase test (SCT) and tube coagulase test are two methods for identifying coagulase production (TCT).
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