Rogosa Agar, a modification of the medium described by Rogosa et al.¹, is a selective medium for the isolation and enumeration of lactobacilli. High acetate concentration and low pH of the medium effectively suppress other bacteria, but also many strains of other lactic acid bacteria. The modification of the pH to 6.2 instead of 5.5 alters the selectivity of the medium for the whole group of lactic acid bacteria^2,3.

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