Foreword

This standard replaces GB/T 4789.31-2003 “Microbiological examination of food hygiene - Examination of Salmonellae, Shigellae, and diarrhoea causative Escherichia coli by means of the diagnostic typing phage set for enterobacteriaceae”.

Compared with GB/T 4789.31-2003, the main changes of this standard are as follows:

——the operation procedures have been revised;

——the Annex B has been added.