Division 4.3 Quantitative method to assess the proportion of ESBL- or AmpC-producing E. coli

F1The appropriate authority may characterise the proportion of ESBL- or AmpC-producing E. coli within the whole E. coli population.

That shall be done by enumerating ESBL- or AmpC-producing E. coli and total E. coli present in a sample using dilution methods and subsequent plating onto selective media and non-selective media, according to the most recent version of the detailed protocol of the European Union Reference Laboratory for Antimicrobial Resistance^f1.