Description
MacConkey Agar without Crystal Violet is a less-selective differential medium for enteric Gram-negative bacteria and selected Gram-positive organisms.
Bile salts provide partial selectivity, while omission of crystal violet permits growth of staphylococci, enterococci and some rapidly growing mycobacteria. Lactose fermentation produces pink-to-red colonies.
Samples are streaked and incubated at 35 ± 2°C for approximately 18–24 hours. Colony colour and morphology support presumptive differentiation.
