1. Total number of colonies: The total number of colonies refers to the total number of bacterial colonies produced by food samples in terms of unit weight (g), volume (mL) or surface area (cm2) after being cultured under strict conditions (sample treatment, culture medium and its pH value, culture temperature and time, counting method, etc.). ).

2. Escherichia coli: Escherichia coli, Citrobacter, Enterobacter and Klebsiella of Enterobacteriaceae are collectively referred to as Escherichia coli. They all come from the intestines of human beings or warm-blooded animals, do not form spores, and ferment lactose at 35-37℃ to produce acid and gas.

3. Pathogenic bacteria: Pathogenic bacteria are bacteria that can make people sick. When the coliform group test is positive and it is suspected that the food may be contaminated by pathogenic bacteria, the pathogenic bacteria test can be carried out. It mainly includes Salmonella, Shigella, Staphylococcus aureus and pathogenic streptococcus, and pathogenic bacteria are not allowed to be detected in food.