Day 4
6. The plates shall be examined and a minimum of 3 colonies from each plate showing suspicion of Salmonella growth shall be subcultured—
(a)onto a nutrient agar plate;
(b)onto a MacConkey agar plate(1); and
(c)into biochemical media suitable for the identification of Salmonella.
These media shall be incubated at 37°C ± 1°C overnight.
(1)
MacConkey agar. See (1963) International Standards for Drinking Water. World Health Organisation Distribution and Sales, CH-1211, Geneva 27, Switzerland