acumedia* MacConkey Agar without Crystal Violet

• Intended Use: MacConkey Agar W/O Crystal Violet is used for the isolation and differentiation of Gram-negative enteric bacilli.
• Product Summary and Explanation: MacConkey Agar is based on the bile salt-neutral red-lactose agar of MacConkey. The original MacConkey medium was used to differentiate strains of Salmonella typhosa from members of the coliform group. Formula modifications improved growth of Shigella and Salmonella strains. These modifications include the addition of 0.5% sodium chloride, decreased agar content, altered bile salts, and neutral red concentrations. The formula changes improved differential reactions between enteric pathogens and coliforms.
MacConkey Agar W/O Crystal Violet is a differential medium and less selective than MacConkey Agar. The lack of Crystal Violet permits growth of enterococci, staphylococci, and Mycobacterium spp.
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