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)on to a blood agar plate;
(b)on to a MacConkey agar plate(1); and
(c)into biochemical media suitable for the identification of Salmonella.
These media shall be incubated at 37°C overnight.
(1)
MacConkey agar – see (1963) International Standards for Drinking Water, World Health Distribution and Sales, CH 1211, Geneva 27, Switzerland.