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Would removing colistin and nalidixic acid from CNA alter the mediums sensitivity or specificity? (See pages 8 and 9, A Wor
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Columbia CNA agar is utilized for the particular disconnection of Gram-positive cocci like Streptococci and Staphylococci. The Columbia CNA agar contains processed casein, processed creature tissue, hamburger separate, yeast remove, corn starch and sheep blood. These segments of the medium make it enhanced to help the development of living beings. Expansion of Colistin and Nalidixic corrosive empowers the medium to be particular for gram-positive cocci keeping the development of gram-negative life forms. Evacuating of Colistin and Nalidixic corrosive does not keep the development of gram-negative life forms and in this way, the affectability and particularity of Columbia CNA agar are modified and blended societies are developed rather than just gram-positive cocci.

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