*They are living, single-celled organism
*They may be carried by a variety of means: food, water, soil, animals, humans or insects
*Under favorable conditions, they can reproduce very rapidly
*Some can survive freezing
*Some change into different forms called spores
*Some cause food spoilage: others can cause illness
*Some cause illness by producing toxins as they multiply, die an break down.
*Typically cooking does not destroy these toxins
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