参考文献: 1、ISO16649-1:2018 Microbiology of the food chain — Horizontal method for the enumeration of beta-glucuronidase-positive Escherichia coli — Part 1: Colony-count technique at 44 degrees C using membranes and 5-bromo-4-chloro-3-indolyl beta-D-glucuronide 2、GB 4789.38 食品安全国家标准 食品微生物学检验 大肠埃希氏菌计数。