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The yellow color on this MSA plate indicates the ability of this microorganism to ferment ​
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The yellow color on this MSA plate indicates the ability of this
microorganism to ferment ​

User Rainabba
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If an organism can ferment mannitol, an acidic byproduct is formed that will cause the phenol red in the agar to turn yellow. Most pathogenic staphylococci, such as Staphylococcus aureus, will ferment mannitol.
User Paul Tarjan
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