Mannitol salt agar plate containing an unidentified staphylococcus species. S. epidermidis Salt is most likely the species.
A selective and differentiating medium is mannitol salt agar (MSA). Since the Staphylococcus genus can withstand high saline levels, the high salt concentration (7.5%) favor's them. While organisms from other genera may develop, they normally do so extremely slowly.
On this medium, Staphylococcus aureus develops and turns mannitol into yellow colonies by fermentation. The majority of coagulase-negative staphylococci and micrococci species do not ferment mannitol and develop as little red colonies.
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