Foreword

This standard replaces GB/T 4789.6-2003 “Microbiological examination of food hygiene - Examination of diarrheagenic Escherichia coli”.

Compared with GB/T 4789.6-2003, the main changes of this standard are as follows:

——the name of standard has been revised to “National food safety standard Food microbiological examination - Examination of diarrheagenic Escherichia coli”;

——the “terms and definitions” and “abbreviations” have been added;

——the H antigen identification in serological test has been added;

——the PCR confirmatory test has been added;

——the Annex A has been added;

——the “equipment and materials” have been revised;

——the “culture mediums and reagents” have been revised;

——the “examination procedures” have been revised;

——the O antigen-group included in diarrheagenic Escherichia coli in serological test has been revised;

——the enterotoxin test has been deleted.