Microbes that can cause disease are called .
Simple single-celled microorganisms such as Salmonella and Clostridium are types of .
Another potential source of food-borne illnesses are , which are microscopic agents that can cause disease.
Food-borne illness can also be caused by microbes that live on dead or decaying organic matter. These kinds of microbes are called .
When some microbes contaminate food, they produce chemicals that irritate the intestinal tract and cause .