What is defined as any unwanted insect or animal that can harm food or spread disease?

The term that describes any unwanted insect or animal that can harm food or spread disease is "pest." Pests are typically organisms that interfere with food production and safety, posing health risks to humans by potentially contaminating food or transmitting diseases. This definition encompasses a wide range of creatures, including insects, rodents, and birds, which may invade food storage areas, prepare surfaces, and ultimately compromise food safety.

Pesticide refers to substances used to kill or control pests, while sanitizer is a chemical agent used to reduce the number of microorganisms to safe levels on surfaces. Shellstock pertains specifically to shellfish in a live state, often related to seafood safety regulations. Thus, these terms do not encapsulate the broader concept of any unwanted organisms that can harm food or spread disease in the same way that "pest" does.