Cross-Contamination is the procedure by which germs, bacteria or other microorganisms are accidentally transferred or transported from one substance or object to another and one human to another with a very harmful effect. Cross-contamination can be shifted to food by hands, food-contact surfaces and a needle from a syringe that will directly inject into the body.
Helps with what? Are you trying to get people to follow them?
True because sometimes authors write just because they want to and other times it’s because they have an actual purpose and want too.