Parasites are different that bacteria, in that they do not multiply in food. Instead, they infect us from sources such as contaminated food or water. They range in size, from microscopic single-celled amoebic-like forms, to worms visible to the naked eye.

They can infect us directly, however many types of parasites infect humans as part of a life cycle that includes other animals.

Infections can produce symptoms that range from mild to severe – even death in some cases.



The Bad Bug Book (US Food and Drug Administration)

Parasites and Foodborne Illness (USDA Food Safety and Inspection Service)

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