Substance in food that does not belong in the food.

Microscopic living substance that accidentally gets into food.

Organism that must live in another living thing in order to survive.

Foods in which bacteria grow best. These foods require control to limit favorable conditions for bacterial growth.

Temperatures at which bacteria grow the fastest.

Transfer of microorganisms from one food item to another.

Living substance so small that a microscope must be used to see it.

Microorganism that reproduces in the cells of other living things.

Tool for measuring temperature.