Final answer:
A disease-causing microorganism that contaminates food is called a pathogen. Pathogens are living things or viruses that cause disease and can be spread from person to person.
Step-by-step explanation:
A disease-causing microorganism that contaminates food, usually from improper handling, is called pathogen. Pathogens are living things or viruses that cause disease and are commonly known as 'germs.' They can be spread from person to person and can cause foodborne illnesses when they contaminate food.