Hormone residue. Hormone residues are harmful factors that do not belong to food. In scientific experiments, the factors or reasons that affect the test indicators are called factors.

1. Microorganisms are very tiny creatures, which are generally invisible to the naked eye, but they exist widely in nature.

Not all microorganisms can make people sick, only some species can cause food poisoning. These microorganisms are usually called pathogenic microorganisms.

3. Some bacteria will spoil food (called spoilage bacteria), but rarely make people sick, while some pathogenic microorganisms (such as Vibrio parahaemolyticus, hepatitis A virus and Shigella dysenteriae) will not cause sensory changes of food. Just because the senses of food haven't changed doesn't mean it's not contaminated by pathogenic microorganisms? )

4. Food contaminated by pathogenic microorganisms is one of the main causes of food poisoning and foodborne diseases. Pathogenic microorganisms are the main cause of food poisoning and the harm that the catering industry should control. )