Description
MacConkey Agar without Salt is a differential medium for examination of urine and other specimens containing enteric and selected Gram-positive organisms.
Omission of sodium chloride and crystal violet limits Proteus spreading and permits growth of staphylococci and enterococci. Lactose fermentation produces pink-to-red colonies, while non-fermenters remain colourless.
Specimens are streaked for isolation and incubated at 35 ± 2°C for approximately 18–24 hours before presumptive colonies are confirmed.
