Mannitol Salt Agar (MSA) is a selective and differential medium. The high concentration of salt (7.5%) selects for members of the genus Staphylococcus, since they can tolerate high saline levels.
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Definition of vault for Students. 1 : a room or compartment for storage or safekeeping. 2 : something like a vast ceiling the vault of sky. 3 : an arched structure of stone or concrete forming a ceiling or roof.