1 Scope
This International Standard gives general guidelines for the detection and enumeration of presumptive Escherichia coli by means of the liquid-medium culture technique and calculation of the most probable number (MPN) after incubation at 37 °C, then at 44 °C. This International Standard is applicable to
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— products intended for human consumption and the feeding of animals, and
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— environmental samples in the area of food production and food handling.
WARNING — Some pathogenic strains of Escherichia coli do not grow at 44 °C.
A limitation of the applicability of this International Standard is imposed by the susceptibility of the method to a large degree of variability (see Clause 10).