EN ISO 21528-2:2017

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Diluent, culture media and reagent
6 Equipment and consumables
7 Sampling
8 Preparation of test sample
9 Procedure
10 Expression of results
11 Performance characteristics of the method
12 Test report
13 Quality assurance
Annex A (normative) - Culture media and reagents
Annex B (informative) - Method validation studies and
        performance characteristics
Bibliography

ISO 21528-2:2017 specifies a method for the enumeration of Enterobacteriaceae. It is applicable to- products intended for human consumption and the feeding of animals, and- environmental samples in the area of primary production, food production and food handling.This technique is intended to be used when the number of colonies sought is expected to be more than 100 per millilitre or per gram of the test sample.The most probable number (MPN) technique, as included in ISO 21528‑1, is generally used when the number sought is expected to be below 100 per millilitre or per gram of test sample.