Use MacConkey Agar No. 3 for detection and enumeration of coliform organisms while isolating and detecting Salmonella and Shigella spp. in pathological and food specimens.

• Selective and differential: due to the inclusion of a specially prepared fraction of bile salts in addition to crystal violet, the medium gives improved differentiation between coliforms and non-lactose fermenting organisms while Gram-positive cocci are completely inhibited.
• Easy-to-read: Escherichia coli (red colonies with bile precipitation) is easy to differentiate from Shigella spp. (straw coloured colonies) and Salmonella (Straw coloured colonies).
• Recommended by the American Public Health Association