SCHEDULE 2Testing Methods
PART 3METHOD FOR THE ISOLATION OF ENTEROBACTERIACEAE
Samples with colonies of Enterobacteriaceae6
After counting the colonies, characteristic colonies shall be taken at random from the agar plates, the number being at least the square root of the colonies counted. The colonies shall be subcultured onto a blood agar plate and incubated aerobically at 37°C±1°C for 20 hours±2 hours.