What Ingredient Makes Mannitol Salt Selective?

Answer

The ingredient that makes Mannitol Salt selective because it contains 7.5% NaCl (salt) which inhibits most organisms other than Staphylococci. Organisms that cannot tolerate high salt concentration will not grow on the plate. Therefore, Mannitol Salt Agar (MSA) is said to be a selective medium for Staphylococci.
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Ans: 7.5% Sodium Chloride. Mannitol Salt Agar (MSA) is a selective (7.5 % soduim chloride) and differential (mannitol) medium. MSA is selective because it contains 7.5% NaCl (salt
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