Description
MacConkey Agar No. 2 is a selective differential medium for enterococci, coliform bacteria and other enteric organisms.
The modified bile-salt system is less inhibitory to enterococci while lactose and neutral red differentiate fermenters. Enterococci form small intense-red colonies, lactose-fermenting bacteria form pink-to-red colonies and non-fermenters remain colourless.
Samples or cultures are streaked for isolation and incubated at 35 ± 2°C for approximately 18–24 hours before characteristic colonies are confirmed.
