BS ISO 16649-1 2018 Edition, April 30, 2018
Microbiology of the food chain — Horizontal method for the enumeration of
beta-glucuronidase-positive Escherichia coli Part 1: Colony-count technique
at 44 ° C using membranes and 5-bromo-4-chloro-3-indolyl beta-D-glucuronide