PP1725 – MacConkey Agar No.2

This is a selective medium primarily for the isolation and differentiation of bile tolerant gram-negative (enteric) organisms and differs from the original MacConkey formulation in that as well as Bile Salts, Crystal Violet has been included as an additional selective agent. This has the effect of inhibiting gram-positive micrococci and non-faecal streptococci. It does however allow enterococci to grow and is useful in assisting in their recognition in the presence of coliforms.