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Why is direct selective or differential plating used for saureus testing rather than selective enrichment isolation?
Wiki User
∙ 12y ago
Selective enrichment media are useful in recovering organisms which are in very low numbers, and they are often formulated like their corresponding isolation media.Selective enrichment will enhance their growth over competing bacteria,however undesired bacteria may grow.S.aureus grows poorly in the presence of others food microflora.By adding a selective agent to "poison" undesired organisms making the medium restrictive by including a nutrient only certain organisms can use or by leaving something out therefore direct selective or differential plating is more efficient to isolate s.aureus.Metabolically,it can utilize mannitol,which are not seen with other staphylococcal species.
Wiki User
∙ 12y ago
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