Columbia C.N.A. Agar Base with 1% Agar, 500G

Columbia C.N.A. Agar Base w/ 1% Agar is recommended for selective isolation of pathogenic Gram-positive cocci from clinical and nonclinical specimens. The addition of the antimicrobial agents, colistin (or polymyxin B) and nalidixic acid, renders the medium selective for gram-positive microorganisms. Blood supplies X-factor and V-factor necessary for the growth of many fastidious bacterial species. Columbia C.N.A. Agar Base on addition of blood and antimicrobial agents facilitate selective isolation of gram-positive cocci, Staphylococci and Streptococci. Appearance: Cream to yellow homogeneous free flowing powder Gelling: Firm, comparable with 1.0% Agar gel Color and Clarity of prepared medium: Basal medium: Yellow ;After addition of 5% v/v sterile defibrinated blood: Cherry red colored Basal medium: Clear to slightly opalescent ; After Addition: opaque gel forms in Petri plates